The ventricles are thicker than the atria because they must pump blood farther.

Name: The ventricles are thicker than the atria because they must pump blood farther.
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The ventricles have thicker walls than the atria because they need to generate more force to pump blood throughout the body (left ventricle) or to the lungs (right ventricle), whereas the atria only need to pump blood into the ventricles.

The Ventricles Are Thicker Than the Atria Because They Must