The process that describes how the blood flows through the heart is termed circulation, specifically cardiac circulation. Blood flow follows a precise pathway: oxygen-poor blood enters the right atrium, flows into the right ventricle, and is pumped to the lungs for oxygenation. Oxygen-rich blood then returns to the left atrium, moves to the left ventricle, and is distributed throughout the body. This continuous cycle ensures that tissues receive oxygen and nutrients while removing carbon dioxide and waste, essential for maintaining physiological function and overall health.