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GK QUESTION#3780

In the human circulatory system, oxygenated blood returning from the lungs first enters which chamber of the heart?

  1. ARight atrium
  2. BLeft atriumCorrect answer
  3. CRight ventricle
  4. DLeft ventricle
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Answer

B. Left atrium

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Explanation

Pulmonary veins return oxygenated blood from the lungs to the left atrium. It then passes into the left ventricle.

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