Physiology Of The Gastrointestinal Tract Apr 2026

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The gastrointestinal (GI) tract operates through a coordinated system of motility, secretion, digestion, and absorption to process food, regulated by enteric neural and hormonal mechanisms. Featuring a four-layered structure, the tract relies on regional specialization—including stomach acid secretion and small intestine nutrient absorption—to maintain homeostasis. Detailed information is available from the NIDDK . Physiology of the Gastrointestinal Tract