Choose the most correct statement concerning capillaries.
A) Networks of capillaries are called capillary nets.
B) Almost all capillaries are open at the same time.
C) The only site of nutrient, gas exchange, and waste exchange is the capillaries.
D) Pre-capillary sphincters contract to increase capillary flow.
E) The walls of capillaries contain smooth muscle.
Correct Answer:
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