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Fibrin clot is formed in blood coagulation from

AFibrinogen by enzyme thrombin
BSerum albumin by enzyme renin
CGlobulin by enzyme amylase
DProthrombin by calcium ions alone
Answer & Solution
Correct answer: A. Fibrinogen by enzyme thrombin
Thrombin converts soluble fibrinogen to insoluble fibrin threads, which trap formed elements to form the clot. Thrombin itself comes from inactive prothrombin via the thrombokinase enzyme complex. Ca2+ is essential throughout.
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