Phychology paper on cognitive developmental stages Essay Example for Free

Phychology paper on cognitive developmental stages Essay During Piaget’s stages of cognitive development, he introduces four different stages that children go through all the way up to adolescents. Piaget states that none of these stages can be skipped. These stages show how a child’s mind is intellectually developing over time as they grow. Their cognitive abilities progress and they begin to have a better understanding of the world around them. Throughout this paper I will explain the four stages of cognitive development; sensorimotor, preoperational, concrete operational and formal operational. The first stage of cognitive development that Piaget states is the sensorimotor stage. This stage is initiated at birth and lasts normally through when the child is 18 months. Everything in this stage is learned from the child exploring different things the best way they know how, whether by putting things in their mouth, or learning how to make the toys move on their play mat. Also, early language development occurs during the early part of this stage such as â€Å"coo-ing†. Then language progresses into words towards the later part of this stage where the child starts forming actual words such as â€Å"No†, and â€Å"Mine†. The second stage of cognitive development is the preoperational stage. This stage starts around 18 months, and lasts until about the age of 7. Children start being able to grasp symbols. For example, they can draw a series of squares with a triangle on top to represent a house. They also start to learn the alphabet, which is, of course, the set of symbols we use to read and write. On the other hand, they don’t understand abstract concepts like amounts, speed, or weight. In one of Piaget’s most famous experiments, he showed that children at this stage can’t comprehend that if you pour liquid from a short, wide glass into a tall, narrow glass, it’s still the same amount. The third stage of cognitive development is the concrete operational stage. This stage starts around 7, and lasts until 12 years old. In this stage children comprehend ideas like weight, amount, and speed, and can understand that the amount of liquid in the two glasses is the same. For example, a younger child in this stage would explain what would happen if you hit a glass with a feather based on what he knows about feathers, whereas the older child reasons from the previous statement and answers according to the logic proposed. They can also understand causal relationships; though not necessarily explain the reasoning behind them. The last stage of cognitive development is the formal operational stage. This  stage starts after about the age of 12. At this stage children begin to understand abstract concepts and reason logically. If you ask them what â€Å"justice† means, they can explain it. In this stage formal operational thinking is being illustrated.

Mechanisms in the Cardiovascular System

Mechanisms in the Cardiovascular System The mechanism of the pumping action of the heart can be categorized in three phases- the generation of an action potential, conduction of the action potential and cardiac muscle contraction (action potential-contraction coupling). The action potential is generated the specialized autorythmic myocardial cells located at the Sino atria (SA) node. The potential spreads to the atria and enters the ventricles through the atria ventricular (AV) node from where it is conducted throughout the ventricles by the bundle of His and the purkinje fiber. The action potential triggers muscle contraction as it sweeps around the heart1. As the cardiac muscles contract and relax the heart beats repeatedly, in the process receiving and pumping blood, first to the lungs then to the rest of the body. As it leaves the heart, the blood carries with it oxygen and nutrients to the body and brings back metabolic wastes from the body cells 1, 2. However, much as it supplies blood to the rest of the body, the heart itself needs blood to support its metabolic activity. The heart is thus supplied by the coronary arteries which branch off from the aorta. Reduction in the volume of this coronary flow can greatly impair the pumping action of the heart and if not treated, can cause heart failure. A number of treatment options ranging from surgical to drugs are available2b. THE CARDIOVASCULAR SYSTEM The cardiovascular system is an organ system responsible for distribution of nutrients and oxygen to the bodys cells and removal of metabolic byproducts from the cells. It consists of the following: Blood which carries nutrients and oxygen to the cells and metabolic byproducts away from the cells The blood vessels which are the pathways through which blood flows The heart which receives and pumps blood. Embedded in the heart are valves that control blood flow and ensure that blood flows in a specified direction3,8. THE HEART In brief, the heart is a muscular organ enclosed in a double walled sack called the pericardium. It is about the size of a fist and weighs between 250 grams and 350 grams. It is located within the medial cavity of the thorax between the second and fifth intercostal space, just on the superior surface of the diaphragm, anterior to the vertebral column and posterior to the sternum7. The heart is divided in four chambers, the right and left atria, the right and left ventricle. The circulation process is such that the right atrium receives blood from the rest of the body through the venacavea and feeds it to the right ventricle which pumps it to the lungs through the pulmonary artery to be oxygenated. Blood from the lungs comes back to the left atrium through the pulmonary vein and finally to the left ventricle. The left ventricle pumps blood to the rest of the body though the aorta and arteries7,1. The Mechanism of Heart function The most important function of the heart is to pump blood. The mechanism by which the heart pumps blood can be understood by examining the events that lead to cardiac muscle contraction. The contraction process starts with the generation of an action potential from the sinoatrial (SA) node giving rise to a depolarization wave. The wave spreads through the atria, entering the ventricles through the atrioventricular (AV) node and is conducted throughout the ventricles by the bundle of His and the purkinje fibers1. Generation of action potential. The heart is composed of two kinds of cardiac muscle cells- the contractile and autorythmic cells. The contractile cells are responsible for the mechanical work of pumping and therefore form the bulk of the cardiac muscles. However, these cells need to be excited before they can contract. Highly specialized autorythmic cells are responsible for generation and conduction of the excitation signal-the action potential1,3. These autorythmic cells are found in specific regions of the heart that include: The SA node. This is a small region located at the upper wall of the right atrium. The AV node. This is a bundle of the autorythmic cells found at the lower wall of the right atrium, near the septum that separates the atria from the ventricles. The bundle of His. This is a bundle of specialized conductive cells that originate from the AV node and runs down the septum between the ventricles. It separates into the right and left bundles serving the respective ventricles. The purkinje fiber. These can be regarded as terminations of the bundle of His. They spread over the base of the ventricles.The locations of the autorythmic cells are the origin and pathways of the action potential3. The cardiac action potential The SA node is the pace maker of the heart. It sets the frequency at which the heart beats. Looking at the cardiac cell, the action potential starts by the reorganization of the intracellular and extracellular concentration of potassium, sodium, chloride and calcium ions due to changes in the cell membrane permeability. A graph showing a typical myocardial cell action potential is shown in figure 1 below. Figure 1: Cardiac cell action potential. Source4: As in the graph, the different phases represent different stages of depolarization of the cardiac cell. Phase 4: In this phase, the cell is at rest. In the resting state, the cell membrane is more permeable to potassium and therefore the resting potential is more or less equal to the potassium equilibrium potential (-90mV). Phase 0: As the potential slowly rises, the voltage-gated sodium channels open leading to a rapid influx of potassium into the cell causing rapid depolarization. At the same time, the membrane permeability to potassium slowly reduces as the potassium channels close. This process takes the membrane potential to around +20Mv before the sodium channels suddenly close. Phase 1: On inactivation of the sodium channels, potassium continues to leak out of the cell and chloride ions go into the cell causing a small downward deflection of the action potential. Phase 2: At this stage, there is increased permeability of the membrane to calcium ions. The inward calcium movement is balanced by an outward movement of potassium ions accounting for the relatively flat phase 2. Phase 3: An increase in the permeability of potassium outweighs the inward calcium current and eventually tips the potential of the cell. This is the repolarization phase and the cell goes back to its resting potential, phase 43,4. Excitation-contraction coupling As described in muscle contraction, the action potential-contraction coupling is due to the release of calcium from the cells sarcoplasmic reticulum. The calcium combines with troponin which regulates the tropomyosin, removing it from the binding site. This allows myosin to bind to actin thus making the muscle to contract3. The cardiac cycle The depolarization and repolarization of the cardiac cell described above triggers the contraction and relaxation to the atria and ventricles of the cell. The cardiac cycle is divided in two main phases, diastole which is the period of relaxation and systole which is the period of contraction. Systole. During this phase, the depolarization wave starts from the SA node, spreading first through the atria and causing the atria to contact first. This forces blood from the atria to the ventricles. At this time, the atrioventricular valves are open while the pulmonary and aortic valves are closed. The depolarization wave then enters the ventricles through the AV node, spreading over all the ventricles via the specialized conductive bundle of His and the purkinje network. This causes the ventricles to contract forcing the blood to the lungs through the pulmonary vein and the rest of the body through the aorta. Here the atrioventricular valves close while the pulmonary and aortic valves open5,3. Diastole. After contraction of the atria, the cells are repolarized. This allows the atria to relax thus allowing blood to flow into them through the vena cavea. After the ventricular contraction, the ventricles also relax awaiting to be filled with blood from the atria5. THE CIRCULATORY SYSTEM The circulatory system is part of the cardiovascular system and is divided into the pulmonary circulation and systemic circulation. The pulmonary circulation transports deoxygenated blood from the heart to the lungs and returns oxygenated blood from the lungs to the heart9. The systemic circulation transports oxygenated blood from the heart to the rest of the body and brings back deoxygenated blood from the body back to the heart9. Deoxygenated blood enters the right atrium from the vena cava and flows through the tricuspid valve into the right ventricle. It is pumped from the right ventricle through the  pulmonary semilunar valve  into the pulmonary arteries which go to the lungs. Oxygenated blood returns via the pulmonary veins and enters the left ventricle through the mitral valve. It is the pumped through the aortic valve, to the aorta then through the arteries to the rest of the body. It is evident that oxygen is very important in metabolic activity of the body cells 3,9. Transport of oxygen by the cardiovascular system The red blood cells. One of the functions of the cardiovascular system is to distribute oxygen around the body. Oxygen is carried in blood by the red blood cells. Understanding the structure of the red blood cells will help us to understand how it is able to carry oxygen. The molecule of a red blood cell is composed of four polypeptide chains with each polypeptide chain having an iron-containing heme group. Each of the four iron atoms can combine reversibly with oxygen according to the equation: O2+Hbà ¢Ã¢â‚¬  Ã¢â‚¬ HbO2. It is therefore possible that each molecule of hemoglobin can carry up to four molecules of oxygen1b,2b. Oxygen uptake Blood is pumped from the right ventricle to the lungs to be oxygenated. In the alveoli, the partial pressure of oxygen is higher than that in the blood and the partial pressure of carbon dioxide in the alveoli is lower than that in the blood. The pressure differences make it possible for oxygen to diffuse from the alveoli to the blood, thus binding to the iron in the hemoglobin. Carbon dioxide on the other hand diffuses from the blood to the lungs. Carrying oxygen, blood is returned to the left atria then to the left ventricle which pumps it to the rest of the body2c. Oxygen release: In the tissues and organs, the cells are undergoing metabolism, continually consuming oxygen and releasing carbon dioxide. This means that the intracellular partial pressure of oxygen is lower than that in the blood and the intracellular partial pressure of carbon dioxide is higher than that in the blood. Again the pressure differences make it possible for oxygen to diffuse from the blood to the cells and carbon dioxide from the cells to the blood, binding again with the iron in the hemoglobin. Therefore, as blood flows around the body, it continually distributes oxygen2c,6. BLOOD SUPPLY TO THE HEART Coronary flow In order to perform its functions, the heart an abundant supply of oxygen and nutrients and therefore needs a dedicated supply of blood. Coronary circulation is that part of the systemic circulation that provides blood supply to the heart. Just as the aorta leaves the left ventricle, it gives of the right and left coronary arteries9. The left coronary artery divides into smaller braches supplying blood to the apex and the posterior side of the heart, the ventricles and part of the anterior interventricular septum, the left atrium and posterior wall of the left ventricle. The right coronary artery supplies the lateral aspect of the right atrium and ventricle, the posterior wall of both ventricles and the SA node9,10. Effect of reduced coronary flow on cardiac function The energy demand of the cardiac muscle is so crucial that an interruption of blood supply to any part of the myocardium can cause necrosis within minutes9. A decrease in coronary flow to levels below normal is called myocardial ischemia. The ischemia can be caused by vascular spasms of the coronary arteries, atherosclerosis or increased activity of the heart beyond levels that the coronary arteries can supply10. Temporary or reversible obstruction of coronary blood flow can cause chest pain known as angina pectoris9. Chronic myocardial ischemia can lead to myocardial infarction where myocardial cells die and are replaced by scar tissue. Reduced coronary flow therefore can affect cardiac function in several ways. If the heart is not able to meet its metabolic demand, it can be understood that it will not be able to pump enough blood to the body. Reduced blood flow to the rest of the body can result in serious physiological and pathological conditions which are beyond the scope of this essay. With the death of some cardiac cells as in the case of chronic ischemia, several other life threatening conditions can arise which affect cardiac function. One of such dangerous conditions is ventricular fibrillation which is an abnormal pulse generation triggered by the damaged myocardial cells. The heart will not be able to pump blood but will just quiver around without any net output. Death can occur within minutes2b,6. Treatment of reduced coronary flow Other immediate effects like ventricular fibrillation caused by reduced coronary flow can be treated by defibrillation. However, the main cause of reduced coronary flow is coronary artery occlusion or restriction and the following treatment options are available: Coronary bypass: This is a surgical technique where the occluded coronary artery is cut and replaced by a new blood vessel, usually a vein taken from somewhere in the patients body2b. Coronary balloon angiography (cardiac catheterization): This is another surgical procedure where a catheter containing a balloon at its tip is passed into the occluded artery. The balloon is enlarged thus stretching the artery and opening it in the process2b. The use vasodilator drugs such as nitroglycerine: These drugs dilate the coronary artery thereby lowering the total peripheral resistance. This reduces the work the heart must do in ejecting blood. This is usually given to people who have already suffered myocardial infarction to reduce the risk of another occurance2b,10. A person at risk of myocardial infarction can be put a low cholesterol, low fat diet to reduce the risk of atherosclerosis and takes aspirin to reduce the risk of blood clot formation. Conclusion The cardiovascular system is one of the most important systems of the body. All the other systems and organs of the body depend on it for supply of oxygen and nutrients and removal of metabolic wastes. The heart acts as a pump to make sure blood is circulated to all parts of the body through pulmonary and systemic circulations9. However, the heart itself needs supply of blood in order to perform its main function of pumping blood and the heart is supplied by the coronary circulation. Reduction in coronary flow means the heart will not be able to meet it metabolic needs and therefore cannot pump enough blood. This can adversely affect normal activity of the body and cause death10. References Sherwood L. Fundamentals of physiology a human perspective. St. Paul Minn: West publishing company; 1991.190-199 1b. Sherwood L. Fundamentals of physiology a human perspective. St. Paul Minn: West publishing company; 1991.263-266 Vander A, Sherman J, Luciano D. Human physiology, the mechanisms of body function, seventh edition. Boston: McGrow-Hill; 1998. 387-389. 2b. Vander A, Sherman J, Luciano D. Human physiology, the mechanisms of body function, seventh edition. Boston: McGrow-Hill; 1998. 374-377. 2c. Vander A, Sherman J, Luciano D. Human physiology, the mechanisms of body function, seventh edition. Boston: McGrow-Hill; 1998. 479-483. Koeppen M B, Stanton A B. Berne and Levy physiology, sixth edition. Philadelphia, PA: Mosby/Elsevier; 2008. 289-303 Serguei Semenov (2009): Lecture notes. Physiological measurements, ecg/pacemakers/defibrillators. Cohen J B, Wood L D. Structure and function of the human body, seventh edition. Philadelphia: Lippincott Williams and Wilkins; 2000. 195-204. Vandegriff K.D, Benazzi L, Ripamonti M, Perrella M, Tellier Le Y.C, Zegna A, Winslow R M. Determination of the rate and equilibrium constants for oxygen and carbon monoxide binding to R-state human Hemoglobin,199: The journal of Biological Chemistry ; 266 (26): 17049-17059 Elaine N M, Katja H. Human anatomy and physiology, seventh edition. Menlo Park: Benjamin Cummings; 2007.674-681 Sherwood L. Human physiology: from cells to systems, sixth edition. Belmont, CA: homson/Brooks/Cole; 2007.300-304 Saladin K S. Anatomy and physiology: The unity of form and function, fifth edition. Maidenhead: McGraw-Hill Higher Education; 2009.683-755 Stanfield C L, Germann W J, Niles J N, Cannon J G. Principles of human physiology, third edition. San Francisco: Pearson/Benjamin Cummings; 2009. 361-366 Skeletal Muscle Question: Describe the structure of skeletal muscle and how it contracts (90) and discuss a disease that may arise from this system (10) The structure of skeletal muscle and the mechanism of muscle contraction including muscle disease (1553 Words) 1.0 ABSTRACT Skeletal Muscle is a form of fibrous tissue with the fibers arranged parallel to each other. A muscle fiber (cell) is surrounded by the endomysium. A group of these cells is wrapped by fascicles. Bundles of fascicles are covered by the perimysium and bundles of the perimysium are wrapped by the epimysium to form a muscle. The muscle fibers have contractile properties which enable them to move bony levers in order to produce skeletal movement1. The functional unit of the muscle fiber is the sacomere which consists of most importantly, actin and myosin. The actin and myosin are arranged such that during contraction, they can slide over each other thus shortening the muscle2. Muscles suffer from many diseases, one of which is polymyositis. This is an inflammatory myopathy that affects mainly the muscles of the thorax and those around the torso. It affects all age groups but has been noticed mainly in late childhood and early adulthood. The sypmtomps are nonspecific but results in general muscle weakness and the cause, though believed to be an invasion by the white blood cells, is not very clear10. 2.0 The Structure of Skeletal Muscle. In daily life, structures and arrangements of designs are dictated, to a large extent by the purpose and function for which the design is meant for. Knowing that skeletal muscle is made up mainly of fibrous tissues, the arrangement of these tissues and how they are bound together to maintain a particular shape in order to accomplish different purposes (mainly to generate force and produce movement) may to a large extent, define the structure of the muscle4. At a macro level, the skeletal muscle is composed of bundles of individual muscle fibers, the supporting structure called the basal lamina, and the connective tissue sheaths as shown in figure 1. These connective tissues bind the cells together giving them strength and partly providing mechanical protection2. We can examine these connective tissues and their functions as follows: 2.1 The basal lamina. This is an extracellular matrix that acts as a scaffold on which a cell sits. It has been realized that apart from providing structural support, the basal lamina can orient and constrain cell during the process of regeneartion3. 2.2 The endomysium. This is a fine sheath of connective tissue that surrounds each individual muscle cell. The endomysium consist of loosely interlacing fibers composed mainly of collagen4. 2.3 The perimysium and fascilces. The individual muscle fibers wrapped by the endomysium, are grouped together in what is called fascicles. A layer of fibrous tissue called the perimysium wraps each fascicle4. 2.4 The epimysium. This is the outside layer that finally wraps the whole muscle. It is composed of dense irregular connective tissue4. Figure 1 Source: http://www.web-books.com/eLibrary/Medicine/Physiology/Muscular/muscle_structure.jpg 3.0 The muscle cell Having described how individual muscle cells are organized into a muscle, it is imperative that we look at the structural composition of the cell itself. Just like many other cells in the body are specialized according to their functions, skeletal muscle cells are specialized to produce force and movement5. The skeletal muscle fiber is thus composed of mainly three structural elements:-the myofibrils, the sarcoplasmic reticulum and the mitochondria, each contributing a unique aspect of muscle function. The entire function of the muscle can be attributed to the shifts in proportions of these three structures6. 3.1 The Myofibrills. These are cylindrical specialized sub-units within the muscle fiber. They consist of two types of contractile protein filaments-the thin filaments referred to as actin and the thick filaments referred to as myosin. The two most important parameters of the myofibrils are their diameter which determines its strength and the fiber length which determines it contraction velocity and distance over which the fiber can contract. The myofibril consist of two filaments-actin and myosin6,2. 3.1.1 Actin (thin filament). Actin filaments are responsible for regulation of contraction. The actin filament is formed by a helical arranged of actin monomers which is an ambiguous protein2 (figure 2). Because of the helical nature, a long grove is formed along the filament and the protein troponin is located at intervals along the length of the actin filament. It is troponin which is responsible for turning on contraction2,7. Figure 2.The actin molecule. Source: http://www.ucl.ac.uk/~sjjgsca/Muscleslidingfilament1.gif 3.1.2 The Myosin (thick filament). Myosin filament is about 150nm long. It has a tail and two heads. The tail is formed by two helical shaped fibers that coil around each other. A collection of several of these helical tails together form a myosin filament (figure 3)4b. Figure 3. The myosin molecule. Source: http://webanatomy.net/anatomy/myosin.jpg. 3.2 The sarcoplasmic reticulum (SR). Groups of about 200 thick and thin filaments constitute a myofibril. Each myofibril is thus enclosed in a membrane called the sarcoplasmic reticulum8. The SR membrane stores and releases calcium during muscle contraction and relaxation. The SR can therefore be thought of as the functional unit of the myofibril9. 3.3 The mitochondria. Found within the cell cytoplasm, the mitochondria are responsible for generation of most of the cells energy by the production of adenosine triphosphate (ATP). There are several mitochondria distributed along the length of a myofibril4. 4.0 The mechanism of muscle contraction Muscle contraction can largely be attributed to the structure of actin and myosin, their arrangement within the SR and the interaction between them in order to produce force (Figure 4). This type of arrangement allows the thin actin filaments to slide in and out by the action pull of the myosin heads8b. Figure 4. Actin and myosin arrangement: Source: http://www.exrx.net/Images/ActinMyosin.gif Muscles are composed of a number of actin and myosin filaments arranged in series in a basic unit called the sacomere. The sacomere consists of a thick filament in the meddle and two thin filaments, one overlapping on each side. The heads of the thick filament attach to the thin filament at the overlap and these heads allow movement in only one direction. When activated, each thick filament head rachets repeatedly along the actin, pulling the two actins closer together. Since the actin are attached to the Z line (The distance between two Z lines form the sacomere), ends of the sacomere (Z lines) are pulled in and the sacomere shortens. The sacomeres are arranged in series so that when the muscle fiber contracts, all the sacomeres contract simultaneously transmitting the force to the end of the muscle. The whole process of contraction described above occurs when the muscle is electrically stimulated2b. 5.0 Muscle stimulation. Skeletal muscle cells are stimulated by the motor neurons of the somatic nervous system. The reception of the motor stimulus (action potential) opens the calcium channels allowing calcium which is stored in the SR to be released. The release of calcium causes the release of acetylcholine-Ach (neurotransmitter). The calcium binds to the troponin on the actin filament. Troponin then regulates the tropomyosin which obstructs binding sites for myosin. This allows the tropomyosin to move, unblocking the bonding site. Myosin then binds to the unblocked site on the actin and applies a pull. This will pull the Z bands towards each other thus shortening the sacomere, causing muscle contraction2b. However, as calcium is released, the ATP-dependent calcium pump is activated and it continuously pumps calcium back to the SR to be stored again. This leads to a drop in calcium level within the cytoplasm. When the calcium level is too low, the calcium binding action to troponin is terminated, releasing tropomyosin which again blocks the binding site. This stops the interaction between actin and myosin thus relaxing the muscle2b. 6.0 Muscle Diseases There are a number of muscular diseases and disorders ranging from acquired, familial to congenital. Limiting ourselves to one of the acquired disorders of the muscles, lets look at polymyositis. 6.1 Polymyositis (PM). PM is a type of muscle inflammatory myopathy. Just like the name suggests, this disease causes inflammation of the muscle fiber. Although the causes of the disease are not well understood, it is believed that PM begins when white blood cells, spontaneously invade muscles. This can result in severe muscle weakness. Polymyositis is a persistent disease characterized by periods of increased and reduced or no symptoms. PM affects mainly the muscles of the thorax and is more common in women than men. It is said to affect all age groups although is it commonly noted in early childhood or 20s10. Key pathologic and diagnostic features of the disease. Endomysial inflammation. This is the inflammation of the outer connective tissue that surrounds the muscle fiber. This is done by the white blood cells that leave the blood and enter the tissue, somehow confirming the earlier assertion that the PM begins when white blood cells invade muscles. Invasion of myofibers by autoaggressive lymphocytes. This is when the T lymphocytes begin to attack the intact myofibers. Unlike in muscle dystrophy where inflammation is associated with degenerating myofibers, the invasion of T lymphocytes causes inflammation of health myofibers in PM.This causes inflammation of healthy myofibers. Other diagnostic features that may not be exactly specific to PM include myofiber necrosis, myophagocytosis, myofiber atrophy and fibrosis, a feature of chronic PM10,11. 7.0 Conclusion Human movement is only possible because of the action of muscle contraction. Voluntary contraction of muscle is made possible by the somatic nervous system which sends out an action potential activating the contraction process. The process is accomplished by the sliding of myosin and actin over each other. Many diseases and disorders affect muscles, prominent among them is muscular polymyosis which causes inflammation of the muscles mainly around the torso. Its believed to be caused by the unwanted action of the white blood cells and the symptoms include muscle weakness.

Venezuela Culture Facts And History History Essay

Venezuela Culture Facts And History History Essay Venezuelas culture has been molded by the Spanish colonialists that ruled the country for almost four centuries. Before and during the Spanish conquest, the indigenous people had little influence on the development of the nation since they were scattered tribes with no political or social presence. Along with order and organization, the Spanish also brought Christianity to the South American continent and as a result, Venezuela has one of the largest Christian populations within its borders. Thus, most of the nations customs and traditions have been derived from medieval Christian practices and depict the influence of the Orthodox Catholic Church. However, the most popular image associated with Venezuelan culture is that of the Ilanero or the South American Cowboy. The entire tradition arose from the animal breeder and cattle wranglers that made the fertile grasslands of the Ilanos their home. The national dance of Venezuela i.e. the Joropo as well as the components of Venezuelan ins trumental music such as the maraca and the quartro are all derived from the Ilanero tradition. Writing has become a feature of Venezuelan culture since the post-independence period of the nineteenth century. Literary masters such as Simon Rodriguez and Andres Bello were the first to make their mark on Venezuelas literary scene. Simon Bolivar, the liberator of the nation and hero of the Independence struggle, also wrote nationalistic works during this period. Also emerging at the later end of the 19th century was the well-known writer and translator Juan Antonio PÃ ©rez Bonalde. His ties with the Free Masons made him the subject of a tremendous amount of speculation but his works have survived through it all. Venezuelan art was given a leg-up by the popularity of Venezuelan writing and sculptors such as Marisol (Escobar) and Rafael Soto made their presence felt internationally. VENEZUELA FACTS South American nations are steeped in a rich history of people and civilization, dating back thousands of years. This region also has some of the worlds plushest and most diverse natural resources and about ninety percent of all know plant and animal species are found here. However, with respect to human and economic development, South America lags behind and a large percentage of the population live without basic amenities. One of the exceptions to this situation is the Bolivarian Republic of Venezuela, which has prospered due to its oils reserves and whose natural beauty has earned it the sobriquet Land of Grace Venezuela became an independent nation in 1830 and today is a thriving federal republic. It has had a history of militarism, but rarely has the country seen an utterly violent phase of existence. The nation is comprised of over twenty five million people from various ethnic backgrounds. Like much of South America, Venezuela was also under the rule of the Spanish conquistadors for much of the medieval period of history. Consequently, the country is mainly Roman Catholic and its culture arises out of traditions inspired by its Spanish past. Given the general character of South American nations, most people are surprised by Venezuelas near perfect rate of literacy and the moderation with which the nation is governed. The nation is divided in to 23 states, called estados in addition to the capital district of Caracas. Although its relations with the United States are a little tainted, Americans traveling to Venezuela rarely have to put up with any angst on political issues. Venezuela is generally divided in to four geographic zones as per its major land features. These are the northwestern Andean mountain terrain, the coastal Caribbean and Pacific Ocean region, the central grass plains or Llanos and the Guyana highlands in the south. The climate of Venezuela is largely tropical, very mild in the highlands and hot in the plains. South Americas largest lake i.e. Lake Maracaibo and the worlds highest waterfalls the Angel Falls are located in Venezuela. The country is facing environmental degradation largely due to the irresponsible nature of mining in the forests. The government however has identified the problem and actions are being taken to correct the natural balance. VENEZUELA HOLIDAYS The nation of Venezuela has a rich and varied past, although much of it was erased by the Spanish conquest. The nation today is fast developing power in the global economy, with an abundance of resources and an immaculate but judicious military background to back it up. The nation was one of the first to experience the missionary services of clerics who migrated from Europe to preach the Word to the new world. Most of the population, nearly ninety-six percent, is Roman Catholic, with Protestants and indigenous religions making up the remaining bit. As a result, most of the holidays are Christian celebrations that fall in common with all such holidays the world over. Such as most other nations, Venezuela follows the Gregorian calendar, where the year begins on the January, the first, marking the first holiday of the year. This is followed by a festival commemorating the visit of the three Magi to Jesus Christ on the Day of Epiphany on the 6th of January. The next Christian holidays fall on the days of Ash Wednesday, Palm Sunday and Easter. St Joseph, the husband of the Virgin Mary is commemorated on the 19th of March whereas the Mother, herself is praised on the day of the Immaculate Conception, held on the 8th of December. In between the two holiday s lies All Saints Day, celebrated on the first day of November. Such as the accepted norm, Christmas Eve and Christmas Day are celebrated on the 24th and 25th of December, whereas the 31st is observed as the last day of the Civil Year. The remaining holidays of Venezuela are centered around its freedom struggle, that lasted from 1810 to 1830. Many famous and decisive battles as well as the birth anniversaries of the leaders of the freedom struggle are commemorated in the form of national holidays. The first among them is April 19th, which marks the beginning of the struggle. The Day of the Liberator or the birth anniversary of Simon Bolivar, who was personally responsible for freeing much of South America from the Spaniards, is one of the most important days for all Venezuelans. It is celebrated on the 24th of July whereas the Venezuelan Independence Day is on the 5th of July. VENEZUELA PEOPLE The people, and not the forests, rivers and mountains, make up a nation. Without knowing the people, no one can claim any knowledge about any place, because the essence of that knowledge lies in the people that inhabit the place. The real way to understand the people of a region is to interact and communicate with them, one-on-one, even if it is for just a little while. However, many prefer studying the demographic as a statistic rather than getting to know individuals on a personal level. Travel will always amount to little if it escapes an introduction to the people of the land. Venezuela is a prosperous nation on the northern edge of South America with a population of nearly twenty five million people. Most of the people have ancestral connections to the indigenous populations of South American which were the basis of the Mayan and Incan civilizations. The second major ethnic group is of the people with European descent, whose roots are thee people who entered the land of Venezuela along with the Spanish conquistadors and remained as residents. This group sees a vast variety of people, who were originally citizens of Spain, Portugal, Italy and Germany. Another large majority of people descend form the African laborers who were brought to Venezuela by the Spanish as slaves and later formed settlements of their own. A small percentage of the population is formed by migratory Arabs, Central Americans and Asians. Venezuela is a largely Catholic community and thus the customs of the land are largely dictated by the religion, although the region is hardly orthodox in its outlook. The official language, spoken by nearly the entire population is Spanish, but a large number of dialects are prevalent in different regions. People between the ages of fifteen and sixty form the largest art of the demographic and thus the nation has a largely young and vibrant atmosphere. Also, more than ninety percent of the population is qualified as educated due to which the prevalence of diseases such as AIDS has been checked in Venezuela. Venezuela is also one of the few Latin American countries with a nearly even male/female sex ratio. VENEZUELA HISTORY We are not makers of history. We are made by it Martin Luther King Jr. To learn where we are going, it is very necessary to see where we came from. History, even if it just a mingling of romance and imagination at times, is of paramount importance if humanity is to be prevented from repeating its past and ruining its future. Most of South American history speaks of destruction of the land and the people at the hand of colonial powers. Venezuela, like any other nation was not spared its due when the great butchers of Europe came to proclaim the virgin land ad their own. In the classical period, that is the earliest known period of human habitation in Venezuela, the country was home to nomadic tribes of people. These tribes were not nearly as civilized and urbanized those of the Egyptian kingdoms or even those of the other Mesoamerican civilizations. The three main groups of people were the Arawak, the Carib and the most advanced amongst them, the Chibcha. The Chibcha were credited with creating a highly organized agricultural system, complete with terrace farming on the slopes of the Andes and use of irrigation canals. Unlike the Mayan cities and the Aztec pyramids that dot the remaining sites of ancient civilization in South America, Venezuelan people have left no such wonders for generations to gaze up on. The modern phase of Venezuelan history begins in 1498, when the renowned explorer Christopher Columbus set foot on the mainland of what is now South America. Other explorers such as Alonso de Ojeda, soon followed and discovered that the land was virtually flawless and unlimited in natural beauty. The locals had come up with ingenious methods to construct on top of water along the edges of Lake Maracaibo by using stilts. The houses raised on stile were called palafitos and they resembled dwellings in Venice and thus, the area was named Venezuela or little Venice. As modern methods of surveying had not been established, Venezuela was not marked out as a mineral-rich territory. Consequently it was spared the pillaging that the remainder of the land, rich is gold, was forced to endure. It was chalked out a poor and unimportant nation and shocked the world after its independence when massive oil reserves were discovered on its soil. Customs and tradition are written by the hands of the past and become engraved in the lives of the people. Customs define the land and all those that live on it. They give humans something to cling on to when they are on foreign soil, lonely and bereft, they give hope in the time of the greatest ostrasization. Venezuela is a land of immense natural beauty and national pride. Both of these are amply evident in the way the people live, eat and celebrate. Most Venezuelan customs can be traced back to the nations colonial past under the Spanish. The reason that native influences are missing from these traditions is that that no native organized civilization existed in Venezuela before the Spanish entered the scene. Of course indigenous people were present, but their dissipated culture was hardly responsible for shaping Venezuela, as it is known today. The most significant custom of Venezuela is the national dance the Joropo. It is essentially Spanish in its feel, resembling the Samba and Salsa in many ways. Joropo is meant for couples and has a few basic steps, which are varied in numerous ways to create a sequence. A large majority of Venezuelas population is Catholic and the nation constitutes some of the most vibrant and colorful customs known in the Christian world. Foremost among them is the rhythmic Red Devils of Yare dance, which is performed to celebrate the symbolic victory of good over evil on Corpus Christi day. The dance involves people dressed as the Gods angels who fight those costumed as the Devils demons and usually lasts all day. Initially the angels look like they are going to loose the battle, but at the end of the day, virtue triumphs. Christmas traditions are also marvelous in Venezuela, with celebration beginning as early as the 16th of December. The nativity scene is put up in most households and the churches display elaborate scenes from the bible. On Christmas morning, when the children awake to find presents under the Christmas Tree, they are told that the Infant Jesus and not Santa Claus has left them these things.

Social Isolation In The Interesting Narrative Of The Life Of Olaudah Eq

Olaudah Equiano in his Interesting Narrative is taken from his African home and thrown into a Western world completely foreign to him. Equiano is a slave for a total of ten years and endeavors to take on certain traits and customs of Western thinking. He takes great pains to improve himself, learn religion, and adopt Western mercantilism. However, Equiano holds on to a great deal of his African heritage. Throughout the narrative, the author keeps his African innocence and purity of intent; two qualities he finds sorely lacking in the Europeans. This compromise leaves him in a volatile middle ground between his adapted West and his native Africa. Olaudah Equiano takes on Western ideals while keeping several of his African values; this makes him a man associated with two cultures but a member of neither. Olaudah Equiano during his long journey is exposed to Western ideas and customs. Although he is initially frightened by them, writing "and I was now persuaded that I had gotten into a world of bad spirits, and that they were go to kill me" (755), he eventually begins to see Europeans as "men superior to us" (762). In this change of perceptive Equiano begins to endeavor to emulate his more pale counterparts. To further this cause, he begins to improve himself through education. He embarks on a quest to read and write having already partially learned his adopted tongue some two to three years after he arrives in England. He is put into school by Miss Guerins while his master's ship is in port and while in her service Equiano is taught Western Christianity and baptized. He thus begins to take on the European religious character as well as the new Enlightenment ideal of self-improvement. During Equiano's service... ...other leaving him somewhere between both. Olaudah Equiano's Interesting Narrative provides insight into cultural assimilation and the difficulties such assimilation. The writer embraces several Western traits and ideals yet guards his African virtues jealously. In doing so however, he finds himself somewhere in between a full European and a displaced African. This problem of cultural identity Equiano struggled with is still present in modern American society. The modern day African-American appears to also be in the process of deciding the between two competing cultures and often being left somewhere in middle becoming a victim of cultural identity just like Olaudah Equiano some 250 years ago. Works Cited Olaudah, Equiano. The Interesting Narrative of the Life of Olaudah Equiano, or Gustavus Yassa, Written by Himself. New York: St. Martin's Press, 1995.

Tennessee Williams The Glass Menagerie Essay -- Tennessee Williams Gl

Tennessee Williams' The Glass Menagerie We all have illusions. We can hardly live without them. Most of the time they are harmless thoughts about things that are usually unattainable. An example would be when a person sees something that they want and then dreams of having it. Whenever someone holds an opinion based on what they think is true, or in some cases what should be true, rather than what actually is true, then that is an illusion. Illusions sometimes help people cope with painful situations, but in the end, illusions are only a false escape from reality. The characters in the book The Glass Menagerie are each affected by their own different illusions. Tom, Laura, and Amanda all survive because their illusions protect them from the painful facts of their lives. However, illusions can prove to be self-destructive as well as helpful. Do the characters’ illusions hurt them, or are they merely harmless aspects of their personalities? Tom, who is the main character and narrator, suffers from his illusions. Tom’s illusion helps him to escape from his own reality. He sees his job at the shoe warehouse as boring and insignificant. He would rather experience the endless possibilities that life holds. But Tom cannot escape his job, so he tries to escape by going to the movies and writing. When he goes to the movies, he expects to find adventure. Watching someone else’s adventures on the movie screen offers Tom a diversion from his boring existence. â€Å"Yes, movies! Look at them-All of those glamorous people-having adventures-hogging it gobbling the whole thing up! You know what happens? People go to the movies instead of moving! Hollywood characters are supposed to have all the adventures for everybody in America, while everybody in America sits in a dark room and watches them have them! / But I’m not patient. I don’t want to wait till then. I’m tired of the movies and I am about to move!† (p. 96) But since he has to come out of the dark theater and face life again, escape to the movies solves no problems in his life. The vicarious way of life that Tom creates by attending the movies is an illusion because it can never be a true substitute for his own life. Tom realizes in the paragraph above that he is only watching adventures rather than living them. He realizes, also, that movies are only momentary physiological escapes. He uses the movies as a... ...nt from what she wants. Amanda’s life is focused on her children’s happiness because she doesn’t want them to make the same mistakes that she did. This, however, is just an illusion because they will never be what she wants them to be. By trying harder to set them on the right path, she pushes herself even deeper into her illusion. â€Å"Go to the movies, go! Don’t think about us, a mother deserted, an unmarried sister who’s crippled and has no job! Don’t let anything interfere with your selfish pleasure! Just go, go, go-to the movies!†(p.136) By reliving her life, Amanda failed to realize that the personalities of her children were completely different from her own. As a result of her illusions, Amanda drove her son away and hurt herself and the others around her.   Ã‚  Ã‚  Ã‚  Ã‚  If someone was to remove the illusion from the lives of the Wingfield family, which of them could survive the real world? Their illusions might be useful for a short time but the world would pass them by if they maintained an illusionary state. Illusions, therefore, are a destructive trait in the lives of the Wingfield family. Works Cited Williams, Tennessee. "The Glass Menagerie". New York: Random House, 2008.

Kite Runner + Great Gatsby Thoughts

The portrayal of his loyalty towards Emir, how he values their friendship despite Emir's betrayal, his appreciation towards Emir's father, his obedience towards his father, his difficulties, his love towards the wife and son, his well treatment towards his mother who used to abandon him, his dreams and how they shattered, and his ending fate, are Intensely heart-breaking to me. I can't help but sympathies with the character.Nevertheless, the way Hosannas carries himself, through his speeches, actions and his final letter to Emir do not show that he wants the readers' sympathy or compassion. Symbolically, he wants us to know and understand that he still chooses goodness and sincerity, In the midst of the hatred and lies. Despite having his own problems, he still hopes, wishes and wants the best for the people he loves and cares – and he does all that unconditionally. He has a very pure heart and soul. In the story, he may be seen like a victim, yet symbolically, he is the hero. The ending is beautifully inspiring. He ends it by giving Emir a light of hope – telling the readers, that despite anything, there is some hope. No matter how hard circumstances are and were, hope for something better is always there. The Great Gatsby: I've read the Great Gatsby more than a dozen times. It's one of books that I find I can come back to it again and again and learn something new each time. As a story there is nothing that amazing about The Great Gatsby. It's so simple and in many ways eradicable, yet works so wonderfully well, making it irresistible.It's constructed as a series of ticking time bombs that make you simultaneously want them to go off to relieve the pressure, but not go off, so you can enjoy the way things are slowly unraveling for as long as possible. My favorite part is definitely the first person narration, and how easy Fitzgerald makes it seem to put internal thoughts and commentary between plotting, dialog and observation. Though there were ma ny moments that made me feel uncomfortable: moments of anti-smelts and racism, which, on afterthought, were probably appropriate for asses America.

Heart of Darkness Novel on Seaman’s Life Charlie Marlow

Joseph Conrad's novel Heart of Darkness is about a seaman named Charlie Marlow and an experience he had as a younger man. Early in the novel it becomes apparent that there is a great deal of tension in Marlow ¹s mind about whether he should profit from the immoral actions of the company he works for which is involved in the ivory trade in Africa. Marlow believes that the company is ignorant of the tension between moral enlightenment and capitalism . The dehumanization of its laborers which is so early apparent to Marlow seems to be unknown to other members of the Company's management. In this story Marlow's aunt represents capitalism. Her efforts to get him a job are significant because of the morally compromising nature of the work of which she seems totally ignorant. When Marlow expresses doubts about the nature of the work, she replies, â€Å"You forget, dear Charlie, that the labourer is worthy of his hire† (12). It is clear that Marlow has mixed feelings about the whole idea. At one point, trying to justify his actions to himself, he says, â€Å"You understand it was a continental concern, that Trading Society; but I have a lot of relations on the living continent, because it's cheap and not so nasty as it looks they say† (12). Marlow finally takes the job, however, and tells himself that the pain and unusually harsh treatment the workers are subjected to is minimal. During the tests and the requirements that he has to undergo before entering the jungle Marlow feels that he is being treated like a freak. The doctor measures his head and asks him questions such as, â€Å"Ever any madness in your family?† (15). In this part of the story Marlow is made to feel small and unimportant. Any feelings or concerns that he has are not important to the company, and as a result, he feels alone. It is only logical that Marlow would have been second guessing his decision and feeling some kinship with the other (black) workers who are exploited, but he does not reveal any such understanding. Upon reaching his destination in Africa, Marlow finds that things are just the same. At the point when he is denied rest after traveling twenty miles on foot he sees things are not going to change. Marlow then tells of how disease and death are running wild through out the area, and the company does nothing in the way of prevention other than to promote those who stay alive. Marlow's theory on why the manager was in that position was that â€Å"†¦he was never ill† (25). This is a bad situation for Marlow because he sees his boss as a simple man with little else to offer the company other than to be a mindless foreman over the operation. This is an example of the company stripping self worth from its workers in the sense that it does not encourage or expect input from them. This is all significant because Marlow finds himself in a position where he is giving up a big piece of himself and his beliefs to make money. The tension between capitalism and moral enlightenment in the first twenty pages of this story is evident. Conrad uses Marlow to depict a seemingly good-hearted person caught in the middle of the common dilemma of moral ethics and desire for monetary success. Marlow knows that there is a great deal of repugnance in what he is doing, yet he finds himself forced to deal with it in his own personal way, which is justify it or ignore it. It is clear that the company also is forced to deal with this same issue, but it does it simply by pretending that it is not dehumanizing its entire work force. This blindness allows the Company to profit and prosper, but only at the expense of the lives of the workers in the jungle who have no way to protest or escape and the â€Å"white collar† workers like Marlow who have to live with their hypocrisy.