The anatomy of the human body is depicted in this human body diagram. Different organs can collaborate to perform a common function, such as how your digestive system breaks down food. An integrated unit is referred to as an organ system. Organ system groups collaborate to form complete, functional organisms like us! The human body has eleven major organ systems. The circulatory system is a web of blood, blood vessels, and lymph that runs throughout the body. As shown in this human body diagram, the body's distribution system for oxygen, hormones, and essential nutrients is powered by the heart. Through a chemical breakdown process, your digestive system allows your body to convert food into usable nutrients.