The wall of capillaries consists of ________.
A. tunica externa and an endothelium supported by a layer of areolar connective tissue
B. tunica externa, tunica media, and an endothelium supported by a layer of areolar connective tissue
C. a layer of smooth muscle and an endothelium supported by a layer of areolar connective tissue
D. an endothelium supported by a layer of areolar connective tissue
Answer: D
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