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The left ventricle of the human heart has walls about three times thicker than the right ventricle. What is the main reason for this extra thickness?
AIt receives blood from the lungs
BIt pumps oxygenated blood to the whole body
CIt pumps blood only to the lungs
DIt stores deoxygenated blood briefly
Answer & Solution
Correct answer: B. It pumps oxygenated blood to the whole body
1. The thickness of a ventricle wall matches the force its blood must be pushed with.
2. The left ventricle gives rise to the aorta, which carries blood to the whole body.
3. Pushing blood the long distance around the body needs the greatest force, hence the thickest wall.
4. Option A (receives blood from the lungs) describes the left atrium's job, not why the ventricle is thick.
5. Option C (pumps only to the lungs) is the right ventricle's lighter task, so it is a trap.
6. Option D (stores deoxygenated blood) is wrong, as the left side handles oxygenated blood.
7. So the thick wall exists to pump oxygenated blood body-wide, option B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 14 Transportation in Plants and Circulation in Animals "Structure of Human Heart", p.215_
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