Which of the following substances,if introduc | vedclass

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(D) The correct answer is $D$. Thromboplastin is a complex substance released by damaged tissues or platelets that initiates the extrinsic pathway of

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Thromboplastin

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(D) The correct answer is $D$. Thromboplastin is a complex substance released by damaged tissues or platelets that initiates the extrinsic pathway of blood coagulation. When introduced into the bloodstream,it triggers the conversion of prothrombin into thrombin in the presence of calcium ions $(Ca^{2+})$. Thrombin then converts soluble fibrinogen into insoluble fibrin threads,leading to the formation of a blood clot at the site of introduction.

Which of the following substances,if introduced into the blood stream,causes coagulation of blood at the site of its introduction?

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