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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 mâ¦ore easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use.
Functions of the Digestive System The major functions of the digestive tract include the following six processes, summarized in Figure 1: 1. Ingestion Food must be placed into the mouth before it can be acted on. This is an active, voluntary process called ingestion. 2. Propulsion Foods must be propelled from one organ to the next.