Prothrombin which helps in clotting of blood is released by

A. lymphocytes

B. erythrocytes

C. monocytes

D. blood platelets

Answer: Option D

Solution(By Examveda Team)

Prothrombin is a plasma protein which is converted into thrombin in the presence of thromboplastin released by platelets at the site of injury. The thrombin then converts protein fibrinogen into insoluble fibrin and thus aids in blood clotting.

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  1. Bola Sayed
    Bola Sayed :
    2 years ago

    9) Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called: *

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