The gastrointestinal (GI) tract is a long passageway that functions to allow ingestion, digestion, and absorption of nutrients and fluids, and elimination of solid wastes from the body. The components of the GI tract are the mouth, teeth, salivary glands, esophagus, stomach, small intestine, pancreas, liver, gallbladder, large intestine, and anus. Inherited defects in structure or function, or infection, physiologic and psychological factors may affect ingestion, digestion, or elimination. The system is a common site of minor disorders in infants and children.
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