Your heart functions as a dual-pump system that never stops, beating approximately :

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

Receives deoxygenated blood from the body and pumps it to the lungs.

The right and left ventricles pump blood out of the heart.

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: