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Which of the following carries impure blood?

  • A.Aorta
  • B.Alveoli
  • C.Pulmonary vein
  • D.Pulmonary artery

Answer: D

The pulmonary artery carries impure, deoxygenated blood - from the right ventricle to the lungs.

It is the one artery that does so; the pulmonary vein is likewise the one vein carrying oxygenated blood, from the lungs back to the left atrium. The rule that arteries carry pure blood fails for exactly this pair.

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