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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.
Digestive System Functions & Organs for the... 1  Digestive System I: The Upper Gastrointestinal Tract 9:09. 2  Digestive System II: The Lower Gastrointestinal Tract 6:54. 3  Anatomy and Physiology of the Mouth 6:50. 4  Anatomy of the Throat and Esophagus 8:29. 5  Physiology of the Stomach and Gastric Juices 8:17.