Digestive tract and digestive glands from the two parts. The human digestive tract including the mouth, pharynx, esophagus, stomach, small intestine (including duodenum, jejunum, ileum) and colon (including cecum, appendix, colon, rectum). Digestive glands, including salivary glands, gastric, liver, pancreas, intestinal glands. Its main function is to secrete digestive juices.