A patient receives an injury to the skin that causes minor blood loss. Primary hemostasis is activated, during which:
A) Severed blood vessels constrict.
B) Thromboplastin is released.
C) Prothrombin is converted to thrombin.
D) Fibrin is lysed.
Ans: A
Feedback: Primary hemostasis involves the severed vessel constricting and platelets collecting at the injury site. Secondary hemostasis occurs when thromboplastin is released, prothrombin converts to thrombin, and fibrin is lysed.
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