Multiple choice

Veins have valves to

  1. prevent back flow of blood

  2. prevent the collapse of the vein

  3. maintain its position in the body

  4. None of these
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A Correct answer
Explanation

Veins collect blood from different organs and bring it back to the heart. They do not require thick walls as found in arteries because the blood is not under pressure. However, veins have valves that ensure that the blood flows only in one direction towards the heart and thus, prevent back flow of blood.

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