Multiple choice

Oxygen rich blood from the lungs first enters the _________ of heart.

  1. left atrium

  2. left ventricle

  3. right atrium

  4. right ventricle
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A Correct answer
Explanation

Oxygenated blood from the lungs comes to thin walled upper chamber of the heart (left atrium). Left atrium is relaxed when it is collecting the oxygenated blood. After that, it contracts, while the next chamber (the left ventricle) expands. So, the blood is moved to left ventricle. If the left ventricle contracts, it pumps the oxygenated blood to different parts of the body.

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