Anatomy of Human Heart with Labels: The human heart is a muscular organ divided into four chambers—two atria on the top and two ventricles below. Blood flows through the right atrium from the body, moves into the right ventricle, and is pumped to the lungs via the pulmonary artery for oxygenation. It returns oxygen-rich blood into the left atrium, moves into the left ventricle, and is then pumped throughout the body via the aorta. Valves such as the tricuspid, pulmonary, mitral, and aortic valves prevent backflow and maintain unidirectional blood flow. The labeled diagram usually includes arteries, veins, and the septum that separates the left and right sides of the heart, offering a clear visualization of this vital circulatory organ.
