The main function of the human heart is to pump blood throughout the body, delivering oxygen and nutrients to tissues while removing carbon dioxide and waste products. This muscular organ operates as a double pump: the right side channels deoxygenated blood to the lungs for oxygenation, while the left side pumps oxygenated blood to the rest of the body. The heart's enduring rhythm is regulated by electrical impulses that ensure it beats efficiently, maintaining circulation at varying demands during rest and physical activity. Proper heart function is essential for overall health and the body's homeostasis.