The digestive system is responsible for breaking down food, absorbing nutrients from the food, and ridding the body of waste products from the food. The digestive system consists of the:

• Upper digestive tract, which includes the mouth, esophagus, stomach, and first part of the small intestine.
• Lower digestive tract, which includes the last part of the small intestine, the large intestine, and the rectum.
• Liver, pancreas, and gallbladder.