Blood Clotting Essay Example for Free

Blood Clotting Essay Coagulation, or thrombogenesis, is the process by which blood clots in an attempt to restrict blood loss from an injury site, and repair the damaged vessel. Most of the time clotting is a good thing, however there are circumstances when a clot can form abnormally, leading to heart attack, stroke, or other serious medical problems. A blood clot forms almost immediately after the bleeding occurs, which is possible through enzymes and other substances in blood that respond to breaks in vessel walls. The clot is a temporary fix preventing further blood loss. There are four major parts of blood clot formation. The first step in clotting is the formation of the platelet plug. Platelets are the smallest of the three major types of blood cells whose primary function is to prevent bleeding. When encountering a damaged blood vessel, the platelets become stimulated and rush to the injury site where they clump together, forming a plug and restricting the bleeding. They also release substances to begin the chemical reaction of the clotting process. These chemical reactions are responsible for growing the blood clot. Dissolved proteins, also referred to as clotting factors, are contained within the blood for the purpose of promoting blood clots. These proteins send signals to each other and enhance each other’s activity exponentially at the site of injury, resulting in a rapid chemical chain reaction which produces fibrin, the main protein forming clots. This blood clot formed with fibrin is tougher and more durable than the platelet plug. Once the blood clot forms, it is important that it not grow and spread to the rest of the body, which can cause serious damage. This is where â€Å"anti-clotting† comes in to play. Proteins such as antithrombin, protein C, and protein S, are known anti-clotting proteins and exist in a natural balance with the clotting factors. These substances work to neutralize excess clotting factors, preventing the clot from going to places it should not. The final part of the process is where the clot is slowly broken down by the body. Once the damaged tissue heals, the body gradually degrades the clot and reabsorbs it. The tough fibrin strands in a blood clot are dissolved by an enzyme called plasmin. Plasmin is activated by other substances working together to help the clot break down. The whole process of blood clotting is whenever the blood is exposed to certain substances. These are known as thrombogenic substances because they promote the formation of thrombus (clot). Many of these substances, such as tissue factor, collagen, and von Willebrand factor, are located in the skin or in the blood vessel walls, typically separated from flowing blood. If they come into contact with flowing blood, this typically means the blood vessel wall is ruptured and bleeding. A clot may also form when blood is not flowing properly. http://www.hematology.org/patients/blood-disorders/blood-clots/5233.aspx http://www.webmd.com/a-to-z-guides/blood-clots

Comparing the Struggle for Power in 1984, Fahrenheit 451, Invisible Man and Julius :: comparison compare contrast essays

The Struggle for Power in 1984, Fahrenheit 451, Invisible Man, Julius Caesar, and Lord Of The Flies If you delve into the content of almost any novel, there is almost always some kind of struggle for power. It could be for rightful integration into society; power over an island; power over a country; or in some cases, even power over the minds of others. These not at all uncommon struggles for power are what keep us interested in the plot of a book. The ongoing battle between a character and his cause makes it impossible to put down a good book. For instance, the novel 1984 by George Orwell is about the struggle of a man and a woman to somehow find a way to get out of the constant barrage of cameras and mind control conducted by their government. Although the two of them eventually lost the battle, there was still a victor in the struggle for power: their government. In the novel Fahrenheit 451, by Ray Bradbury, the main struggle for power deals with the government. This overly oppressive, almost Orwellian style bureaucracy, tries to make sure there is no interaction with books at all. They believe that books permeate their society and corrupt the minds of the people. Unannounced searches of property by "firemen" are not at all uncommon. At the slightest inkling of this futuristic contraband, these firemen will rummage through all of one's property, at times, destroying everything in their path. On the opposite side of that spectrum, there is a struggle for power by the people as well. There is the woman who hid several thousand volumes of books in her house. She loves these books so much that when the firemen ransacked her house, she went down with the books without hesitation. In another example of this ongoing struggle for power, some people's lives were actually transformed into books. Their names changed to the title of the book, and they had to memorize every single written line of text. These people were so determined to fight for what they believed, that it would be impossible to say that some kind of struggle for power did not exist. They were struggling for the power of freedom. There is not only one kind of freedom you can have. Some peoples struggle for the power of freedom might be just to be allowed to exist at all.

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A consumer's utility function is = XSL/eye/4, where x is the quantity of good x consumed and y is the quantity of good y consumed. The prices of the two goods are pix and pay, and the marginal utilities of the goods are Mix = (1 /4)x-3/eye/4 and MI-Jay = (3/4)xx/ay-1 ‘4. A) Derive the consumers demand for good x. B) Discuss the concept of elasticity, with reference to the demand you derived in (a), and contrasting linear and constant elasticity demands. 4. You have been asked to analyze the market for steel.From public sources, you are able to find that last years price for steel was $20 per ton. At this price, 100 million tons were sold on the world market. From trade association data, you are able to obtain estimates for the own price elasticity of demand and supply on the world market as 0. 5 for supply and -0. 25 for demand, respectively. Suppose you know that demand and supply equations in the market are linear. Solve for the equations of demand and supply in this market. INTO 334 By arrival luxuries (L).The consumer's tastes are represented by the utility function IS=FL. Food 2. Let income be I = 80, Pix=4, Pay= 1, and utility U = xx (with marginal utility MIX = y and MI-Jay = x). B) Now, let the price of x fall to 1 and the income fall to 50. Otherwise, there is no utility function is IS(x,y) = XSL /eye/4, where x is the quantity of good x consumed and y the marginal utilities of the goods are MIX = (1 /4)x-3/eye/4 and MI-Jay = (3/4)xx/ay-114. A) Derive the consumer's demand for good x. Able to find that last year's price for steel was $20 per ton. At this price, 100 million

I Am An Expert At The Store - 1664 Words

Over the past three months at Talbots, I feel I have grown not only as an employee but also as a person. Talbots has given me the skills and information that I will need for my corporate internship and for my future. As my time at the store comes to an end, I feel it is important to evaluate myself on my performance at the store. I used the final evaluation sheet given to me by my professor and self-evaluated my performance. Overall, I would rate my performance at the store as outstanding, or a 9/10. I personally feel that I have improved a substantial amount as an employee and I really have seen growth in myself with customer interactions and understanding the merchandise. For my mid-semester evaluation, I needed improvement on my knowledge of the merchandise and customer interaction; I can now say that I am an expert at both. I took the criticism from my last evaluation and used it to fuel my desire to learn the products. Even though I still need improvement on punctuality, I am un able to improve due to train schedules. Maybe, once I move back into the city I will have an easier time arriving to work in a timely manner. Besides punctuality, all other areas of my evaluation were rated outstanding. Even though there was nothing else to improve, I still made sure I was working to the best of my abilities. I really believe I did the best job I could working at Talbots and that is why I rated myself outstanding for the evaluation. At the beginning of my internship class,Show MoreRelatedThe Is The Rationalization Of The Store Of Department Stores Across The Country Essay886 Words   |  4 Pagesaccording to George Ritzer, â€Å"is the rationalization taken to its extreme.† I have the â€Å"luxury† of being employed by Sears, company which is a chain of department stores across the country. At Sears, I am an appliances sales consultant. 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