The human digestive system is the bodily system that allows humans to digest food, in order to supply the organism with the nutrients necessary for its functioning. The food, first chewed in the mouth, then passes through different organs through the digestive tract. The organs included in the human digestive system are the oral cavity, the esophagus, the stomach and the intestines. The food is broken down in each step, into smaller and smaller molecules, and is eventually absorbed into the blood. Waste in the form of fecal matter is rejected through the anus.