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The gastrointestinal tract (GIT) is a continuous tubular structure extending from the mouth to the anus, specialized for ingestion, digestion, absorption, and elimination of food. Its wall consists of four primary layers: the mucosa, submucosa, muscularis externa, and serosa. The mucosa is lined by epithelial cells that secrete digestive enzymes and mucus, and contains specialized enteroendocrine _________ _________ ______ ________ _______ _______ ____.
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