Which of the following is secreted by cells and disintegrating platelets at the site of injury?

Passive absorption

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Active absorption

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Both a & b

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Neither a nor b

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Solution

The correct option is C
Both a & b

Injured cells and platelets secrete thrombokinase or thromboplastin at the site of damage. It is an enzyme that converts inactive prothrombin to active thrombin, with the help of calcium ions. Release of thrombokinase is the first step in the process of blood clotting.

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