During blood coagulation, thromboplastin is released by?

RBC

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Clumped platelets and damaged tissues

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Blood plasma

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Leucocyte

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Solution

The correct option is A Clumped platelets and damaged tissues
The extrinsic pathway begins with a substance called tissue factor (tissue thromboplastin) released by damaged blood vessels and surrounding tissues. In the presence of other plasma proteins (clotting factors) and calcium ions , this leads to the activation of a protein called factor X.
Hence, the correct answer is (B)

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