Veins contain small valves in order to
A) remove waste products from the blood.
B) aid in circulation.
C) pump blood to the heart.
D) prevent the backward flow of blood.
Correct Answer:
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Q12: The sequence of blood flow is
A)arteriesàcapillariesàveins.
B)arteriesàveinsàcapillaries.
C)capillariesàarteriesàveins.
D)veinsàcapillariesàarteries.
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