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Question

Blood protein which initiates blood coagulation is

A
Prothrombin
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B
Thrombin
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C
Fibrinogen
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D
Fibrin
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Solution

The correct option is A Prothrombin
Prothrombin is a plasma protein essential for blood clotting. Whenever there is an injury, prothrombin activator complex is formed. Prothrombin is converted into thrombin by activators. Thrombin acts as an enzyme and converts plasma protein fibrinogen into fibrin threads which form a clot at the site of injury and bleeding is stopped.
So, the correct answer is 'Prothrombin'.

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