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MOUTH The mouth receives food and begins digestion by mechanically breaking up solid particles into smaller pieces and mixing them with saliva. This action is called mastication (mas′′tı˘-ka′shun). The lips, cheeks, tongue, and palate surround the mouth, which includes a chamber ...

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The alimentary canal is a muscular tube about 8 meters long that passes through the body’s thoracic and abdominopelvic cavities. The structure of its wall, how it moves food, and its innervation are similar throughout its length. Structure of the Wall The wall of ...

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