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Blood Donation 에 관한 영어 에세이 입니다.

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In the contemporary society demand for blood is ever expanding with the increase of surgical operations resulting from the development of medicine, the occurrence of medical problems resulting from the rapid growth of the aged population and the increase of violence and accidents causing external injuries. Because the only source of blood is man, however, blood donation is growing more important to meet the rapidly increasing demand for demand. Currently only 3 out of every 100 people in America donate their blood. Most of blood donors donate as an act of charity, but some are paid and in some cases there are incentives other than money such as paid time off from work. Also a blood donor can have blood drawn for their own future use.
There are two different methods of obtaining blood from a donor. The most common one is simply to take the blood out from the vein as whole blood. This blood is typically separated into parts, usually RBC, and plasma, since most of recipients need only specific component for transfusions. The amount of blood drawn varies from 200ml to 550ml depending on the country, but 450~550ml is typical.

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