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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.
Figure 26-1 shows the major organs of the digestive system. Table 26-1 summarizes the structures making up the digestive system. The main function of the overall digestive system (Box 26-1) is to break down food into simpler forms that the circulatory vessels can carry and pass through the cell membranes to the cells. The cells then use these food molecules or nutrients for energy and to build, maintain, and repair body tissues.