In general, as an artery's diameter decreases, there is a(n)

A. increase in both smooth muscle and elastic fibers.
B. decrease in the amount of smooth muscle and an increase in the number of elastic fibers.
C. decrease in both smooth muscle and elastic fibers.
D. increase in the amount of smooth muscle and a decrease in the number of elastic fibers.


Answer: D

Anatomy & Physiology

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