Why doesn't the blood clot in the blood vessels? Blood contains platelet cells which help in clotting of blood when there is any cut on our body. Why doesn't it clot when blood is present inside the blood vessel in a normal healthy body?

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Answer 1 · 2016-03-19T10:57:55

Blood doesn't clot in the blood vessels because of a chemical called heparin.

Heparin is an anticoagulant which does not allow the blood to clot in the blood vessels