Which of the following statements concerning blood vessel walls is true?
A. The tunica adventitia is composed of smooth muscle and endothelium.
B. Capillaries have both a tunica intima and a tunica media.
C. The tunica intima is the innermost layer of a blood vessel wall.
D. The tunica media is found in all blood vessels except veins.
E. Vessel diameter is controlled primarily by the tunica intima.
Answer: C
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