Concerning blood vessel walls,
A. the tunica adventitia is composed of connective tissue.
B. the tunica intima is smooth muscle.
C. the tunica media is an endothelial layer.
D. the walls of arteries are thinner and contain less elastic tissue than veins. E. capillaries have the thickest walls of all the blood vessels.
Ans: A. the tunica adventitia is composed of connective tissue.
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