why the blood present in our body does not clot though it contains haparin ?
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Small quantities of heparin granules are present in basophils. Blood clots after injury prevents blood flow ...
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Explanation:
When blood is exposed to new surface or air it clots.
Blood clotting factors are intrinsic and extrinsic. Some of the factors as surface activation factor stimulates blood to clot when exposed.
heparin prevents clotting of blood in blood vessels. But if there is internal injury, platelets break to release a thermoplastic substance. It initiates clotting.
Similarly, If you have blood in a test tube with heparin added in it. It's not likely to clot. But if you have blood in a watch glass or something with heparin added, air will make it clot.
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