Which vessels in the body act like faucets, controlling the flow of blood into the capillary beds?
a. Arteries
b. Arterioles
c. Veins
d. Venules
ANS: B
Just as faucets control the flow of water into a sink, the smaller arterioles control blood flow into the capillaries. Arterioles provide this control by varying their flow resistance. For this reason, arterioles are often referred to as resistance vessels.
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Fill in the blank(s) with the appropriate word(s).
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