Q:

Veins in the limbs have which one of the following characteristics?

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Veins in the limbs have which one of the following characteristics?


  1. thin walls composed of epithelium
  2. vessel walls with a thick layer of smooth muscle
  3. pulsatile flow
  4. valves

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D: Veins have valves but not pulsatile flow or a thick layer of smooth muscle.

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