A natural "pacemaker" called the sinoatrial (SA) node sends electrical impulses that tell the heart muscles when to contract. đź“Š Heart Rate: The Vital Metric All About Heart Rate | American Heart Association
The right and left ventricles pump blood out of the heart. 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: 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 It is divided into four main chambers: Four
The right and left atria receive incoming blood.
Receives oxygen-rich blood from the lungs and pumps it out to the rest of the body.
Your heart functions as a dual-pump system that never stops, beating approximately :