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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Question 21
Choose the correct statement that describes arteries.

(a) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart.
(b) They have thin walls with valves inside, blood flows under low pressure and carries blood away from the heart to various organs of the body.
(c) They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body.
(d) They have thick elastic walls without valves inside, blood flows under high pressure and carries blood away from the heart to different parts of the body.

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