The Structure of a Capillary Wall Differs from That of a Vein

question 222

Multiple Choice

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

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

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