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Mas ti ca'tion. The process of grinding, or chewing, food in the mouth. Mes'en ter y. Mu'cous mem'brane. The lining membrane, or tissue, of the entire alimentary canal. It is very complex in structure, has different characteristics in different areas, and contains nerves, blood vessels, lymphatics, and in various parts special structures such as glands. It secretes mucous.
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