In general, as an artery's diameter decreases, the artery walls show
A. an increase in relative amounts of smooth muscle and elastic fibers and a decrease in endothelium.
B. a decrease in the relative amount of smooth muscle and an increase in the relative amount of elastic fibers.
C. a decrease in both smooth muscle and elastic fibers and an increase in areolar connective tissue.
D. an increase in the relative amount of smooth muscle and a decrease in the relative amount of elastic fibers.
Answer: D
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