Veins have valves to
a. Prevent back flow of blood
b. Prevent the collapse of the vein
c. Maintain its position in the body
d. None of these
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15
Answer:
d) none of these
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Answered by
2
Answer:
Veins carry the blood back to the heart. ... Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.)
Explanation:
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