Heart.rar May 2026

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

Receives oxygen-rich blood from the lungs and pumps it out to the rest of the body. Heart.rar

Your heart functions as a dual-pump system that never stops, beating approximately : A natural "pacemaker" called the sinoatrial (SA) node

Four valves (tricuspid, pulmonary, mitral, and aortic) act as one-way gates to keep blood flowing in the correct direction. ⚙️ How the "System" Works ⚙️ How the "System" Works The heart is

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.