The document discusses the structure and function of the gastrointestinal system. It describes the different organs that make up the GI tract, including the mouth, esophagus, stomach, small intestine, large intestine, liver, gallbladder and pancreas. It explains the roles of these organs in ingesting, digesting and eliminating food and waste. The document also provides details on nursing assessment of GI issues, including obtaining a patient history regarding diet, bowel habits and gastrointestinal complaints.