Question

multiple choice question
what initiates the extrinsic mechanism of coagulation?
clotting factors in the plasma
prostacyclin coating the endothelium
factors released by damaged blood vessels or tissues
myeloblasts released prematurely from the bone marrow

Explanation:

The extrinsic mechanism of coagulation is initiated by tissue - factor (thromboplastin) which is released by damaged blood vessels or tissues. Clotting factors in plasma are involved in the intrinsic pathway. Prostacyclin inhibits platelet aggregation and clotting. Myeloblasts are not related to initiating the extrinsic coagulation mechanism.

Answer:

Factors released by damaged blood vessels or tissues