Multiple choice

What happens to the oxygenated blood that comes from lungs?

  1. It enters the left atrium of the heart.

  2. It enters the right atrium of the heart.

  3. It enters the left ventricle of the heart.

  4. It enters the right ventricle of the heart.
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A Correct answer
Explanation

Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left, i.e. the left atrium. The left atrium relaxes when it collects the blood.

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