A) Factor VII (proconvertin)
B) Factor XI (plasma thromboplastin antecedent)
C) Heparin
D) Calcium
Correct Answer: A
Solution :
[a] Factor VII or proconvertin or plasma is not used up during clotting. During clotting, it is changed into convertin. It accelerates tissue or extrinsic thromboplastin formation. Factor DC is necessary for intrinsic thromboplastin formation. Calcium is for both intrinsic and extrinsic thromboplastin formation and also in the conversion of prothrombin into thrombin. Heparin is the anticoagulant in the normal blood circulation.
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