Why does Blood not clot inside injured vessel
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For blood to clot your body needs blood proteins called clotting factors and blood cells called platelets .normally platelets clump together to form a plug at the sits of a damaged or injured blood vessels when the blood doesn't clot excessive or prolonged bleeding can occur.
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Blood proteins, prothrombin and fibrinogen do not form blood clot inside blood vessels as these are in inactive form due to the presence of anticoagulant heparin. At the injury, these are activated by thrombokinase enzymes of bloods platelets.
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