The digestive system is made up of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines. In addition, there are a few organs that food does not actually pass through, but they contribute to the digestive process, which include the teeth, tongue, salivary glands, liver, gallbladder, and pancreas. The purpose of this system is to provide energy and nutrients to the body and excrete waste.