Which of the following prevents the conversion of prothrombin to thrombin in an undamaged blood vessel?

Heparin

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Calcium ions

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Thromboplastin

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Fibrinogen

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Solution

The correct option is A Heparin
The lining of the undamaged blood vessels is very smooth and doesn't promote cell or platelets rupture. A substance heparin present in low concentration in blood also doesn't allow the blood to clot. Heparin is synthesized by mast cells of connective tissue and also by liver. Heparin prevent the conversion of prothrombin into thrombin and fibrinogen into fibrin. These two substances are essential for clotting of blood
So, the correct answer is 'Heparin'

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Thromboplastin converts prothrombin in the plasma to thrombin. Which of the following aids this process?

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