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GK QUESTION#3782

In the human circulatory system, what mechanism helps veins maintain one-way flow of blood toward the heart?

  1. APresence of thick muscular walls
  2. BContinuous pumping action of veins
  3. CPresence of valves inside the veinsCorrect answer
  4. DHigh pressure of blood flow
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Answer

C. Presence of valves inside the veins

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Explanation

Valves in many veins, especially those of the limbs, help prevent backward flow toward the capillaries. Skeletal-muscle contractions also assist venous return; not every vein has valves.

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