The primary function of the heart in the circulatory system is to pump blood throughout the body. This muscular organ ensures that oxygen-rich blood is delivered to tissues and organs while facilitating the return of oxygen-poor blood to the lungs. The heart achieves this through coordinated contractions of its chambers: the atria and ventricles. Additionally, the heart plays a role in regulating blood pressure and maintaining proper circulation. Its effective functioning is crucial for overall health and the transportation of nutrients, gases, and waste.