The digestive system is made up of the gastrointestinal tract (or GI) and other organs such as the pancreas, the liver, and the ones mentioned in the question, like the stomach, small intestine and the mouth and teeth. These last two are in charge of breaking food down into smaller molecules.
The small intestine absorbs most digested food molecules, as well as water and minerals, and passes them on to other parts of the body for storage or further chemical change. Specialized cells help absorbed materials cross the intestinal lining into the bloodstream.
