24. Give reasons for the following
(1) The muscular walls of ventricles are thicker than the walls of atria.
(ii) Arteries have thick elastic walls.
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Answers
Explanation:
answer for 1
the ventricle wall is thicker as it needs to pump blood from the heart to other parts of the bodyt (either the lungs, or other parts of the body, depending which side of the heart is concerned). its extra thickness is due to more cardiac muscle, giving a stronger force of contraction to allow the blood to pumped further, under higher pressure. little muscle is needed to force blood from the atria into the ventricles, so the atrial walls are relatively thin.
ANSWER FOR 2
State reason Arteries have thick and elastic walls. Ans. (i) Arteries are the vessels that carries blood away from the heart to various organs of the body. Since, the blood emerges from the heart under high pressure, the arteries have thick and elastic walls.
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