The main function of the heart is to pump blood throughout the body, supplying oxygen and nutrients to tissues while removing waste products such as carbon dioxide. This vital organ comprises four chambers: two atria and two ventricles. The right side of the heart receives deoxygenated blood from the body and pumps it to the lungs for oxygenation, while the left side receives oxygen-rich blood from the lungs and distributes it to the rest of the body. The heart’s rhythmic contractions are regulated by electrical impulses, ensuring efficient circulation to maintain overall health and function in living organisms.