The walls of veins are thinner than those of corresponding arteries, because ________.
A) veins contain a lower proportion of smooth muscle fibers
B) of only arteries can perform vasoconstriction
C) veins contain a greater proportion of elastic fibers and collagen
D) blood pressure is higher in veins
E) the lumen of veins is much smaller than the lumen of arteries of similar diameter

Question

Quizplus · Accepted Answer

Veins have a lower proportion of smooth muscle fibers in their walls compared to arteries, which makes them thinner.

The Walls of Veins Are Thinner Than Those of Corresponding