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  1. Which of the following substances if introduce in the blood stream would cause coagulation at the site of its introduction ?
    1. Fibrinogen
    2. Prothrombin
    3. Heparin
    4. Thromboplastin
Correct Option: D

Thromboplastin is a plasma protein aiding blood coagulation through conversion of prothrombin to thrombin.



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