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Explain why the walls of the lower chambers of the heart are thicker and more muscular than the walls of the upper chambers.
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Explain why the walls of the lower chambers of the heart are thicker and more muscular than the walls of the upper chambers.

User Stanislav Kralin
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This is because the lower chambers of the heart hold more blood, this means more blood volume. More blood volume means it takes more net pressure to pump out the blood from these chambers
User Dhiraj Himani
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