McqMate
| Q. |
It causes clotting of blood - |
| A. | Thrombin |
| B. | Haemoglobin |
| C. | Pectin |
| D. | All of the above |
| Answer» A. Thrombin | |
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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. The activated clotting proteins engage in a cascade of chemical reactions that finally produce a substance called fibrin. Red blood cells become caught up in the web, and a "red clot" forms. |
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