Capillaries are
a. large vessels that transport systemic blood under high pressure to the tissues
b. the smallest branch of the arterial system
c. thin-walled vessels permeable to small molecular substances
d. vessels that transport blood from the tissues to the heart
C
Large vessels that transport systemic blood under high pressure to the tissues are arteries. Arterioles are the smallest branch of the arterial system. Thin-walled vessels that are permeable to small molecular substances are capillaries. Vessels that transport blood from the tissues to the heart are veins.
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