What are blood platelets a source of?

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(C) Blood platelets (thrombocytes) are cell fragments produced from megakaryocytes in the bone marrow. When blood vessels are injured,platelets releas

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Thromboplastin

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(C) Blood platelets (thrombocytes) are cell fragments produced from megakaryocytes in the bone marrow. When blood vessels are injured,platelets release various substances,including thromboplastin (also known as platelet factor $3$). Thromboplastin is essential for the initiation of the blood coagulation cascade,which leads to the formation of a blood clot to prevent excessive bleeding. Therefore,platelets are a primary source of thromboplastin.

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