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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Veins operate under lower pressure than arteries. Valves ensure that blood flows in one direction toward the heart and prevent it from pooling or flowing backward due to gravity.

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