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Q.

Veins have valves to

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a

Prevent back flow of blood

b

Prevent the collapse of the vein

c

Maintain its position in the body

d

None of these

answer is A.

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Detailed Solution

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Veins have valves to prevent the backflow of blood because the blood in veins, valves that ensure blood flows in only one direction and Valves also help blood travel back to the heart against the force of gravity.

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