McqMate
| 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 | |
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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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