Activation of which one of the following coagulation factors is not essential for hemostasis________________?
Correct answer: A. XII
- A. XII
- B. XI
- C. IX
- D. X
Explanation
Factor XII initiates the contact pathway in laboratory testing but is not essential for normal hemostasis in vivo, because tissue-factor-mediated coagulation can generate clotting. Factors XI, IX and X have more important roles in effective coagulation.
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