Heart.rar Apr 2026

The right and left atria receive incoming blood.

A natural "pacemaker" called the sinoatrial (SA) node sends electrical impulses that tell the heart muscles when to contract. 📊 Heart Rate: The Vital Metric All About Heart Rate | American Heart Association Heart.rar

Receives oxygen-rich blood from the lungs and pumps it out to the rest of the body. The right and left atria receive incoming blood

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