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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.
The digestive system. Organ systems are groups of organs that carry out a particular function. The human body has several organ systems, including: 1  The nervous system. 2  The respiratory system. 3  The reproductive system. 4  The digestive system.