Question

why ventricles have thicker muscular walls than atria

Answer 1

Answer:

The ventricles of the heart have thicker muscular walls than the atria. This is because blood is pumped out of the heart at greater pressure from these chambers compared to the atria. ... This is due to the higher forces needed to pump blood through the systemic circuit (around the body) compared to the pulmonary circuit.

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Answer 2

Answer:

Because ventricles have to push blood to the whole body