- The digestive tract (or gastrointestinal tract) is a long twisting tube that starts at the mouth and ends at the anus. It is made up of a series of muscles that coordinate the movement of food and other cells that produce enzymes and hormones to aid in the breakdown of food. - Which organ of the following is not a part of the G.I.T? A. Pancreas B. Liver C. Gallbladder D. Trachea E. Appendix