The story behind the scab.

FDA Consumer | March 1, 1985| | Copyright

Our bloodstream--the circulatory, or vascular, system--serves many functions. It is a food and sewage conduit, a pipeline for defense supplies, and a communications system. It is also continually answering its own version of the question with which Hamlet grappled so fiercely: "To be or not to be?" But for the blood, the crucial, constant question is: "To clot or not to clot?"

Blood is under considerable pressure as it races out from the pumphouse of the heart to the arteries, to the smaller tributaries called arterioles, to the gossamer mesh of the capillaries, ...

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