Calcium is required for (a) Blood clotting (b) Blood formation (c) Muscle contraction (d) All of these
Option A) In the presence of calcium ions and other clotting factors, factor X activates an enzyme called prothrombin activator. This enzyme then converts the plasma protein prothrombin into thrombin. Thrombin is an enzyme that, in turn, converts fibrinogen to fibrin which causes the blood to clot.
