Weibel-Palade bodies containing the procoagulant protein von Willebrand's factor are found in:
a. Endothelial cells of the tunica intima
b. Fibroblasts of the tunica adventitia
c. Macrophages of the tunica intima
d. Nerve endings in the tunica adventitia
e. Smooth muscle cells of the tunica media
ANS: A
When the endothelium of a blood vessel is injured, von Willebrand's factor is secreted into the lumen from endothelial cells to hasten blood coagulation.
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