Prothrombinase is formed in the presence of

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(A) During the process of blood coagulation,an injury or trauma stimulates the release of thromboplastin from injured tissues and platelet factors fro

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$Ca^{2+}$

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(A) During the process of blood coagulation,an injury or trauma stimulates the release of thromboplastin from injured tissues and platelet factors from blood platelets. These factors,along with other clotting factors present in the blood,combine to form the enzyme complex known as prothrombinase. This reaction is strictly dependent on the presence of calcium ions $(Ca^{2+})$. Once formed,prothrombinase converts inactive prothrombin into active thrombin.

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