Platelets participate in hemostasis by
A. secreting nitric oxide and releasing chemicals that promote vasoconstriction.
B. aggregating to form a plug and manufacturing fibrinogen.
C. aggregating to form a plug and releasing chemicals that promote vasoconstriction.
D. secreting tissue plasminogen activator (t-PA) whenever they come into contact with collagen.
E. secreting prostacyclin, which prevents platelet aggregation on blood vessel endothelium.
Answer: C
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