The primary role of the heart is to pump blood throughout the body. It facilitates the circulation of oxygen-rich blood from the lungs to the rest of the body while returning deoxygenated blood to the lungs for oxygenation. The heart is a muscular organ composed of four chambers: the right atrium, right ventricle, left atrium, and left ventricle. It operates through a series of rhythmic contractions, regulated by electrical impulses, ensuring that tissues receive the necessary oxygen and nutrients for metabolism. Additionally, the heart helps remove waste products from the blood, maintaining overall cardiovascular health and homeostasis in the body.