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| 1. |
Explain the mechanism of blood clotting. Class 11 |
| Answer» \tBlood coagulation or clotting is the mechanism to prevent excessive loss of blood from the body.\tReddish brown scum formed at the site of a cut is due to clot formed mainly of a network of threads called\xa0fibrins\xa0in which dead and damaged formed elements of blood are trapped.\tFibrins are formed by the conversion of inactive fibrinogens in the plasma by the enzyme thrombin.\tThrombins are formed from another inactive substance present in the plasma called\xa0prothrombin\xa0by an enzyme complex known as\xa0thrombokinase.\tCalcium ions play a very important role in clotting. | |