A blood vessel with a regular, round profile in cross section, a diameter of about 100 ?m, and one to two layers of smooth muscle would be classified as a(n):
a. Arteriole
b. Capillary
c. Elastic artery
d. Muscular artery
e. Venule
ANS: A
Arterioles typically have a thicker wall, more muscle, and a more regular profile than venules, which tend to be partly collapsed due to lower intravascular pressure.
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