Multiple choice

Pulmonary vein is the only vein which carries ____ blood back to the heart from the lungs.

  1. pure

  2. impure

  3. mixed

  4. thin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pulmonary veins are anatomical exceptions: unlike all other veins that carry deoxygenated blood toward the heart, the four pulmonary veins carry freshly oxygenated blood from the lungs back to the left atrium. This oxygenated blood is then pumped to the body. (Conversely, pulmonary arteries carry deoxygenated blood, making them exceptions too.)

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