What is the role of the digestive system in humans?

The digestive system is responsible for breaking down food into smaller components that can be absorbed into the bloodstream and used by the body for energy, growth, and repair. The process begins in the mouth, where food is broken down by chewing and mixed with saliva. It continues in the stomach and small intestine, where enzymes and acids further break down food. Nutrients from the digested food are absorbed by the small intestine, while the remaining waste is passed to the large intestine for elimination. The digestive system also plays a role in maintaining gut health and immune function.