Q.

Blood does not clot in the blood vessels due to the presence of –

A. Thrombin
B. Fibrinogen
C. Heparin
D. Prothrombin
Answer» C. Heparin
Explanation: There are two major facets of the clotting mechanism — the platelets, and the thrombin system. The thrombin system consists of several blood proteins that, when bleeding occurs, become activated.
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Biology (GK)

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