The main parts of the digestive system are the mouth, esophagus, stomach, small intestine, large intestine, liver, gull bladder, and pancreas. Food does not actually pass thro … ugh the liver, gull bladder and pancreas, but they do produce a green liquid called bile that helps digestion.t is then pushed to the rectum which is the last part of the large intestine, then out the anus and into your toilet. The digestive system refers to the system from the mouth to the  bowels. It is the system that the body used to draw nutrients from  food and to eliminate waste.