Which of the following substances, if introduced into the bloodstream, would cause coagulation of blood at the site of its introduction?

Fibrinogen

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Prothrombin

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Heparin

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Thromboplastin

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Solution

The correct option is D Thromboplastin
Thromboplastin is a plasma protein aiding blood coagulation, through catalyzing the conversion of prothrombin to thrombin. It functions in the conversion of prothrombin to thrombin in the clotting of blood. It is also called thrombokinase.
So, the correct answer is 'Thromboplastin'

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