The function of the heart in the human body is to pump blood throughout the circulatory system, supplying oxygen and nutrients to tissues while removing waste products like carbon dioxide. The heart is a muscular organ, and its rhythm is regulated by electrical signals that coordinate contractions. It consists of four chambers: the right atrium and ventricle, which receive and pump deoxygenated blood to the lungs for oxygenation, and the left atrium and ventricle, which distribute oxygen-rich blood to the rest of the body. Through this continuous cycle, the heart plays a crucial role in maintaining overall health and homeostasis.