Which of the following aids in preventing excess clotting?
a. Thrombin
b. Factor VII
c. Nitric oxide
d. Protein C
ANS: D
The protein C pathway helps regulate the coagulation mechanism by digesting activated coagulation factors V and VIII. Thrombin is the activated form of prothrombin; it plays a number of roles in promoting coagulation, including the splitting of fibrinogen to form fibrin. Nitric oxide counteracts vasoconstriction.
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