Coagulation of blood in blood vessels in living body is prevented by:

Prothrombin

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Heparin

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Prothrombin and calcium together

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Plasminogen and calcium together

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Solution

The correct option is B Heparin
Heparin prevents blood coagulation in the blood vessels. It is secreted by mast cells. It is an anticoagulant, blocking the conversion of prothrombin to thrombin. Haemoglobin is the blood pigment necessary for oxygen transport.
Hence the correct answer is (A)

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