Diagram of how heart functions?

The heart functions as a pump to circulate blood throughout the body. It has four chambers: the right atrium receives deoxygenated blood from the body, which then moves to the right ventricle and is pumped to the lungs for oxygenation. Oxygen-rich blood returns to the left atrium, flows into the left ventricle, and is then pumped out to the body through the aorta. Valves between the chambers ensure one-way blood flow, preventing backflow.