The structure of a capillary wall differs from that of a vein or artery because

A. capillaries are impermeable to all substances.
B. capillaries can constrict or dilate.
C. capillary walls have only endothelium and a basement membrane.
D. the capillary wall has only two tunics.
E. capillaries have more smooth muscle.


Answer: C

Anatomy & Physiology

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