The system responsible for the movement of blood throughout the body is the circulatory system. This system consists of the heart, blood vessels (arteries, veins, and capillaries), and blood itself. The heart pumps oxygen-rich blood from the lungs to the body's cells, while returning carbon dioxide-rich blood back for oxygenation. The circulatory system plays a vital role in transporting nutrients, waste, hormones, and gases, ensuring that all body tissues receive the necessary elements for proper function and health.