Blood vessels have a small, central opening or ________ through which the blood flows
A) capillary
B) endothelium
C) lumen
D) valve
C
Explanation: A) A capillary is the blood vessel, not the central opening.
B) The endothelium lines the wall of a blood vessel.
C) Correct!
D) Valves are in blood vessels but are not the small, central opening.
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