The digestive system is a complex system in the human body responsible for breaking down food into nutrients that can be absorbed and used by the body. It includes organs such as the mouth, esophagus, stomach, small intestine, large intestine, liver, gallbladder, and pancreas. The process of digestion involves mechanical and chemical breakdown of food through chewing, stomach acid secretion, and enzyme activity. Nutrients are then absorbed into the bloodstream through the walls of the small intestine and transported to cells throughout the body for energy production and other functions. Waste products are eliminated from the body through the rectum and anus.