Why don't platelets form plugs in undamaged vessels?
A. Platelets aren't formed until vessel damage occurs.
B. Only contact of platelets with exposed collagen fibers and von Willebrand factor causes them to be sticky and form plugs.
C. Plugs do form, but are removed by macrophages.
D. Platelets don't form plugs, it is the megakaryocytes that form the plugs.
Answer: B. Only contact of platelets with exposed collagen fibers and von Willebrand factor causes them to be sticky and form plugs.
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