The left ventricle has to pump more blood than the right ventricle because the left ventricle has to pump blood through the systemic circulation,which is much larger than the pulmonary circulation.

Question

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The left ventricle does not pump more blood than the right ventricle; both ventricles pump the same volume of blood. However, the left ventricle pumps blood at a higher pressure because it needs to deliver blood throughout the entire body, whereas the right ventricle pumps blood to the lungs.

The Left Ventricle Has to Pump More Blood Than the Right