What is the main function of the circulatory system?

The primary function of the circulatory system is to pump blood around the body. This system is vital for transporting oxygen, nutrients, and hormones to cells throughout the body while also removing carbon dioxide and other wastes. Blood circulation ensures that all body tissues receive the resources they need to function properly and that wastes are effectively eliminated. The heart plays a crucial role in this process by continuously pumping blood through a network of arteries, veins, and capillaries, allowing for efficient distribution and collection.

The other functions mentioned do not pertain to the core role of the circulatory system. Digesting food is primarily the function of the digestive system, filtering waste is associated with the excretory system (especially the kidneys), and providing structural support is a role of the skeletal system. Therefore, the focus on the movement of blood is what makes the circulatory system essential for maintaining life and health.