Veins are much more easily distended under pressure than are arteries
A) only in a few specialized cases.
B) because their walls are thinner and contain a lower proportion of smooth muscle fibers.
C) because their walls are thicker, and veins contain a greater proportion of elastic fibers and collagen.
D) because of vasoconstriction.
E) None of the answers are correct.
D) because of vasoconstriction.
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