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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.
Stomach Function in Digestive System. Stomach carries out the physical and chemical digestion of food. When the muscles contract and relax periodically, it results in the physical digestion of the food. The other stomach function is the chemical breakdown of meal. The enzymes secreted by glands in the walls of stomach help in the chemical breakdown of dietary substances. However, the stomach is unable to digest all the classes of foods.