structure through which food enters the digestive tract
Mouth. The mouth is the beginning of the digestive tract; and, in fact, digestion starts here when taking the first bite of food. Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use.mall intestine. Made up of three segments â the duodenum, jejunum, and ileum â the small intestine is a 22-foot long muscular tube that breaks down food using enzymes released by the pancreas and bile from the liver.