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Give biological reason for the following...

Give biological reason for the following:
The left ventricle of the heart has a thicker wall than the right ventricle.

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The left ventricle has to pump to blood till our toes and to the head against gravity. So its wall are thicker. Right ventricles has thinner walls because it pumps blood only up to the lungs.
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ICSE-SAMPLE QUESTION PAPER 3-SECTION-II
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  12. The phase of cardiac cycle in which the auricles contract.

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