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Question

Why do the walls of the heart differ in thickness ?

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Solution

The left ventricle is thicker muscular wall than the right ventricle because it pumps blood to different parts of the body (systemic circulation), for this high pressure is exerted by the walls of the left ventricle for which strength is required.
Whereas the right ventricle pumps the blood to the lungs for oxygenation. For this less pressure is required as the lungs are close to the heart. Thus the wall of the right ventricle is thinner.

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