Fibrinogen and prothrombin play important roles in the
The correct answer is B. clotting of blood
Prothrombin is transformed into thrombin by a clotting factor known as factor X or prothrombinase.
Thrombin then acts to transform fibrinogen, also present in plasma, into fibrin, which, in combination with platelets from the blood, forms a clot (a process called coagulation).
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