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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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