Question

multiple choice question
the extrinsic pathway of coagulation begins when which factor combines with factor vii?

○ ii
○ ix
○ iii
○ xii

Explanation:

In the extrinsic coagulation pathway, tissue factor (factor III) combines with factor VII to initiate the pathway. Factor II is prothrombin, factor IX is involved in the intrinsic pathway, and factor XII is also part of the intrinsic pathway. So the correct factor that combines with factor VII in the extrinsic pathway is factor III.

Answer:

III (the option with "III")