In general,as an artery's diameter decreases,there is a(n)
A)decrease in the amount of smooth muscle and an increase in the number of elastic fibers.
B)increase in the amount of smooth muscle and a decrease in the number of elastic fibers.
C)increase in both smooth muscle and elastic fibers.
D)decrease in both smooth muscle and elastic fibers.
E)no change in the amount of smooth muscle or elastic fibers.

Question

Quizplus · Accepted Answer

As the diameter of an artery decreases, there is an increase in the amount of smooth muscle and a decrease in the number of elastic fibers. This is because the smooth muscle is responsible for controlling the diameter of the vessel and facilitating constriction or dilation to regulate blood flow, while the elastic fibers provide elasticity to the vessel walls. A smaller vessel generally requires more precise control over blood flow, hence the increased amount of smooth muscle.

In General,as an Artery's Diameter Decreases,there Is A(n)