Toni Morrisons The Bluest Eye Racial and Social-Cultural...

Mr. Henry moves into Claudia and Friedas house. One day, the girls come home and when they walk in Mr. Henry greets them. He flatters them by telling them they look just like Greta Garbo and Ginger Rogers, two white American female actresses. These two actresses represented American societys ideal beauty, with their blonde hair and blue eyes. They, and other actresses like them, were so idealized by the media that it forced young American girls, both white and black, to question their own beauty if it differed from the standard of blond hair and blue eyes. After seeing the cup with Shirley Temple on it, Claudia explains her ill feelings for her. Shirley Temple was the epitome of what all of America adored in little girls: her bouncy†¦show more content†¦Pecolas life away from her family is no better. She is often picked on and called ugly by those around her. Claudia and Frieda realize that the entire neighborhood agrees with Pecola that white features are beautiful. Pecolas parents have both had difficult lives. Pauline always felt like an outsider in her family and constantly suffers through feelings of loneliness and ugliness. She wants to love her daughter but finds Pecola unattractive. Pauline works for a wealthy white family and finds her comfort in their house. Cholly was abandoned by his parents and brought up by his aunt. He was often humiliated by white people and built up a great rage toward whites and women. When he met and married Pauline, things were good for a time, but he soon felt trapped and unhappy. The marriage is dull, except for those moments when they are fighting. One day, as he returns home and finds Pecola washing dishes, Chollys life of desire wells up and he rapes his daughter. Pauline blames Pecola for the rape, seeing it as Pecolas fault. Claudia MacTeer: Narrator of the story, she is nine years old and lives in a green and white run-down, but functional house. Claudia despises the American ideals of beauty, which say that one must have blonde hair, blue eyes, and pink skin to be beautiful. She resents and even reacts violently to these ideals when she destroys the pretty white dolls given to

Introduction Of Stealth Technology Technology - 2104 Words

INTRODUCTION OF STEALTH TECHNOLOGY: Most of the common people would be unaware of this technology and they would first ask what is this technology? Stealth technology is that technology which covers the range of technology which is used by defence men, air craft s, missiles, satellites so that they become invisible to the radar , infrared, solar and other detection methods. It is combination of technologies that aims to reduce the distances at which a vehicle or a person can be detected especially radar cross section reduction. RADAR CROSS SECTION (RCS) REDUCTION- Various methods have been tried to minimize radar detection since the invention of radar. Due to the increased awareness of stealth vehicles and the technologies, development of means to detect stealth vehicles was provided. However development of low RCS is the desire of most of the countries because they are advantageous in detection range deduction. HISTORY OF STEALTH TECHNOLOGY: Like every single technology stealth technology have also the back ground or the history. The development of stealth technology started in 1958, in United States who were trying to prevent the radar detection of its U-2 spy planes from the soviet union during the cold war .However that was unsuccessful .This made the designers to develop a particular shape for the planes that will reduce the detection of planes. The 1st stealth submarines were the U-boat U-480.The HORTEN HO229 flying wing wasShow MoreRelatedAmerican Airpower s Dependence On Technology And Its Influence On Future Employment1254 Words   |  6 PagesAmerican airpower’s dependence on technology and its influence on future employment are best described with the words of General H. H. Arnold shortly after the Second World War: â€Å"The first essential of air power necessary for peace and security is the preeminence in research . . . . 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Dopamine Essay Research Paper Dopamine free essay sample

Dopamine Essay, Research Paper Dopamine As the chemical responsible for the enjoyable esthesiss felt by the human encephalon, Dopastat has been found to be active in many facets of every twenty-four hours life. Any physiological action that receives a positive feedback, such as a handshaking, a buss, or the usage of a drug, can do the degree of Dopastat activity in the encephalon to increase. Dopamine is a neurotransmitter that relays messages from one nerve cell to the following. Through axons, nerve cells influence neurological activity in many parts, specifically the karyon accumbens. The nucleus accumbens is a crude construction that is considered to be the centre for pleasance. When the molecule reaches the terminal of the axon, it is released into the synapse ( the part between the axon stoping and the receiving system cells ) where the Dopastat binds to the receptors of the following cell. Then it is either reabsorbed, or catabolized by the enzyme monoamine oxidase ( MAO ) . We will write a custom essay sample on Dopamine Essay Research Paper Dopamine or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page At the chemical degree, every experience that a individual finds gratifying sums to an surplus of Dopastat at the axon terminations of the karyon accumbens. Keeping the proper balance of Dopastat in the encephalon is critical to survival. For illustration, if degrees are excessively low such as in the significant nigger, so the individual may see the shudders and motion upset of Parkinson? s disease. On the other manus, if the degrees of Dopastat are excessively high, the individual may see hallucinations and the thought upset feature of schizophrenic disorder. In 1975, psychologists Roy Wise and Robert Yokel of Concordia University in Montreal made a find while working with drug addicted rats. Initially, the rats were taught to force a lever that would let go of a narcotic in the signifier of a pellet. After being injected with a dopamine-blocking chemical, the rats would force the lever as many times as possible. It is believed that this showed that the degrees of Dopastat in the encephalon are straight affected by narcotics. That is, narcotics had the ability to change the Dopastat procedure. Drug such as diacetylmorphine, pep pills, and marijuana all trigger the release of extra Dopastat, whereas cocaine blocks Dopastat release. Dopamine is believed to be an of import portion in the acquisition procedure. Dr. P. Read Montague, of the Center for Theoretical Neuroscience at Houston? s Baylor College of Medicine, has said that people should? believe of Dopastat as the proverbial carrot, a wages the encephalon doles out to webs of nerve cells for doing survival-enhancing choices. ? It is non to the full understood how this procedure is put into pattern, but Montague and his co-workers of the Salk Institute in San Diego and M.I.T. have developed a trial theoretical account they believe to be an accurate representation of the dopamine rhythm. Montague developed a computing machine plan that simulated bees involved in garnering nectar. The practical flowers ranged from really sweet, to non sweet at all. This system was intended to stand for the action of Dopastat being used as a wages. They found that 85 % of the clip, the bees would travel to the flowers that were sweet. The flowers had been programmed with a dopamine-like wages system that would travel into consequence when 1 of the bees would set down on a sweet flower. It is believed that a similar system works in the human encephalon. When a individual learns a new endurance maneuver, it is considered that the encephalon releases an extra sum of Dopastat, so that the individual feels compelled to reiterate the action. One of these actions may be to eat in the forenoon, or to analyze for a trial. In add-on to commanding dependence, Dopastat besides functions as an inhibitor in the carotid organic structure. There, Dopastat has a assortment of responses. Dopamine relaxes the lower esophageal sphincter, delays stomachic voidance, and causes certain arteriolas to increase in diameter. Although non proven, it is believed that Dopastat nervus terminations may be present in the kidneys. Many surveies have been done to understand the function that dopamine dramas in human metamorphosis. These surveies have demonstrated that, much like the other chemicals in the human encephalon, Dopastat is a complex substance that is non yet to the full understood. Bibliography 1. ) Braunwald, Isselbacker, Petersdorf, Wilson, Martin, Fauci. Harrison? s Principles of Internal Medicine. New York, McGraw-Hill Book Company. 2. ) Nash, J. Madeleine. ? The Chemistry of Addiction? , Time Magazine. 1997, May 5. Volume 149, Number 18. pg. 36-43.

The Circulatory System Essay Example

The Circulatory System Paper General Functions   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   The circulatory system is the body’s main transport network and cooling system (De Graff, 1998). The human body needs many external substances to survive. We need air, food, and water. However, these substances are not readily absorbed by the body through initial intake. For example, food that is eaten and digested is not yet used to fuel the body’s billions of cells. The nutrients that have been processed need to be transported to each cell in the body in order for them to be used. This is one of the jobs of the circulatory system. The circulatory system is tasked with carrying the important substances that the body needs where they are needed (Hillendale Health, 2007). Furthermore, the system is also responsible for carrying some of the wastes from the cells such as carbon dioxide, away from the cells to be expelled by the body (Delos Johnson, 2006). This cycle of carrying nutrients to body cells and carrying wastes from th em is a way by which the system contributes to the maintenance of physiological homeostasis. Another way that it contributes to homeostasis is by helping maintain the temperature of the body. Without oxygen to burn, the cells in the body will become cold and eventually die (Delos Johnson, 2006). Thus, oxygenated blood carries oxygen to the cells and releases it in order to maintain homeostatic temperature. Last but not the least, the circulatory system also maintains homeostasis by fighting off outside threats that have infiltrated the body. White blood cells which also travel through the system fight back diseases and help keep the body healthy and they need the circulatory system for them to be able to reach the places in the body where particular bacteria are doing damage (Delos Johnson, 2007). We will write a custom essay sample on The Circulatory System specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on The Circulatory System specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on The Circulatory System specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Interactions with other organ systems   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   When we eat food or drink water, it enters our body through our digestive system and is processed in the stomach. Afterwards, the processed food is transported through the small intestines where it is further digested. The small intestine’s inner walls are covered with microscopic finger-like projections called villi which are primarily responsible for taking the nutrients from the digested food and transferring them to the bloodstream where they are carried to the rest of the body (Maton et. al., 1993). Thus, the digestive system and the circulatory system work closely together to nourish the body with food and drink. The circulatory system also works closely with the respiratory system. We take in air through our nose and from there it travels to our lungs. From there, pulmonary arteries which are a part of the circulatory system carries oxygen-depleted blood to absorb more oxygen while releasing the carbon dioxide that it has accumulated from the cells that it delivered nutrients to (Maton et. al., 1993). Of course, the circulatory system takes blood containing nutrients and oxygen to other organ systems of the body in order to enable them to continue functioning. The blood carries nutrients to our muscles, our sensory organs, our brain, and all other parts of our body that need it (Maton, 2003). Parts and functions The Heart   It is a powerful muscle that pumps the blood through the entire circulatory system (Hillendale Health, 2007). The Blood It is the main substance that flows throughout the circulatory system. There are red blood cells and white blood cells that both travel through the circulatory system (Hillendale Health, 2007). Plasma which is the liquid part of the blood carries both these blood cells through the system (Hillendale Health, 2007). The red blood cells carry nutrients from the small intestine and oxygen from the lungs to the cells all over the body (Hillendale Health, 2007). They are also the ones that carry carbon dioxide away from body cells and back to the lungs to be released as waste (Hillendale Health, 2007). The white blood cells travel to areas where harmful germs are infecting body cells and fight those foreign elements to keep the body healthy (Hillendale Health, 2007). There are also platelets found in the bloodstream which acts to help stop bleeding whenever the body gets wounded (Hillendale Health, 2007). For example, whenever we cut ourselves on some sharp object and bleed, the platelets stick to where we cut ourselves and attract more platelets to do the same. This plugs out the wound so that the bleeding stops. The Blood Vessels The blood vessels are the tubes where the blood passes through. There are three types of blood vessels which are arteries, veins, and capillaries (Hillendale Health, 2007). The arteries are blood vessels that carrying oxygenated blood away from the heart while veins carry blood back to the heart (Hillendale Health, 2007). Capillaries are very tiny blood vessels that serve as connections between arteries and veins (Hillendale Health, 2007). The Heart: A closer look   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   The human heart is found in the middle of the thorax with its largest part slightly situated to the left just beneath the breastbone (Maton et. al., 1993). It is a mesh of muscle cells that are joined together by contiguous cytoplasmic bridges (Maton et. al., 1993). Tissues found on the heart’s walls are unique because they have qualities both of smooth muscle tissues and skeletal muscle tissues. The heart is covered by a protective sac called the pericardium (Maton et. al., 1993). The pericardium itself is composed of two parts. The fibrous pericardium is made of dense fibrous connective tissue that serves as the heart’s outer protection while the serous pericardium contains fluid that eases friction generated by heart contractions thus protecting the heart from friction caused by its own beating (Maton et. al., 1993). The right atrium is situated on the right side of the heart where the veins carrying deoxygenated blood are found. This is so that the right atrium can collect the deoxygenated blood and pass it through the heart which pumps it by the right ventricle to the lungs to be oxygenated once more (Maton et. al., 1993). After the blood is oxygenated by the lungs, it goes back to the heart through the left atrium and is pumped by the heart through the left ventricle to the rest of the body. It should be noted that the muscle wall that surrounds the left ventricle is thicker than the wall surrounding the right ventricle. This is because it is harder to pump blood to the rest of the body than to just pump it to the lungs and back (Maton et. al., 1993). Hence, thicker muscle means that the left ventricle is more powerful in pumping blood than the right ventricle. Hypertensive heart disease   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   This diseases pertains to complications caused by arterial hypertension that affects the heart (eMedicine, 2007). Arterial hypertension which is more commonly known as high blood pressure is a condition wherein the pressure of the blood being pumped through the circulatory system is steadily increasing (eMedicine, 2007). This happens due to a variety of factors. Excessive intake of fat can clog up arteries and thus make it more difficult for blood to pass through. Thus, this makes the pressure of blood passing through the arteries increase. Because of the heightened pressure, the arterial walls are subjected to greater strain (Lip et. al., 2000). This can be imagined by visualizing a hose whose channel has been partially blocked. Fluid passing through that hose exerts more pressure on the hose walls and threatens to rupture the hose. In the same way, too much clogging in the arteries can cause pressure to build so much that it could ruptur e the arteries. Once this condition is elevated to dangerous levels, the heart gets affected by the imbalance in the pressure and hypertensive heart disease is developed (Lip et. al., 2000). The disease causes the heart to be strained more and more and may eventually cause it to breakdown and fail. The pressure can also burst blood vessels which can also damage the system. People suffering from this disease are easily fatigued due to the excessive work that the heart is coping with from the increased blood pressure (eMedicine, 2007). They would also have an irregular pulse, have difficulty sleeping, and feel a greater need to urinate at night (eMedicine 2007). If not treated with appropriate medicine, proper exercise and a good diet, hypertensive heart disease can lead death and is in fact one of the leading causes of death in the country (eMedicine, 2007). References De Graaff, V. (1998). Human Anatomy, 5th edition. WCB McGraw-Hill. Delos Johnson, D. (2006). The Circulatory System. Retrieved May 22, 2008 from: http://www.globalclassroom.org/hemo.html eMedicine. (2007). Hypertensive Heart Disease. Retrieved May 22, 2008 from: http://www.emedicine.com/med/topic3432.htm Hillendale Health. (2007). Circulatory System. Retrieved May 22, 2008 from: http://hes.ucfsd.org/gclaypo/circulatorysys.html Lip, G., Felmeden, D., Li-Saw-Hee, F., and Beevers, D. (2000). â€Å"Hypertensive heart disease. A complex syndrome or a hypertensive cardiomyopathy?† European Heart Journal. no. 21 p. 1653–1665. Hopkins, J., McLaughlin, C., Johnson, S., Warner, M., LaHart, D., and Wright, J. (1993). Human Biology and Health. New Jersey: Prentice Hall.