Dictionary of Human Evolution and Biology

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Hollow muscular organ that lies between the esophagus and small intestine. In primates it serves as a temporary storage area for food as well as the site of initial food breakdown. The colobines have a specialized sacculated stomach with an alkaline environment that retains high-fiber food, which is broken down by symbionts. In humans the stomach contains an acid environment and is principally the site of protein digestion.

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From "Dictionary of Nursing and Individual Health Care"