Heart.rar

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

The heart is a fist-sized muscular organ located in the center of your chest, slightly behind and to the left of the breastbone. It is divided into four main chambers: The right and left atria receive incoming blood