Question

multiple choice question
the release of clotting factors by damaged blood vessels and perivascular tissues initiates the ______ pathway of coag

intrinsic

extrinsic

Explanation:

The extrinsic pathway of coagulation is initiated by tissue factor (clotting factors) released from damaged blood vessels and perivascular tissues. The intrinsic pathway is initiated by factors within the blood. So the correct option is the one related to tissue - derived (extrinsic) factors.

Answer:

B. extrinsic (assuming the options are labeled with the second option as extrinsic, following the order of the options shown: first is intrinsic, second is extrinsic)