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The gastrointestinal (GI) system begins with the mouth and ends with the anus. It is approximately 25 feet in length in the adult. The primary functions of the GI system are food digestion, extraction of nutrients, and waste elimination. Parts of the GI tract include
Mouth
Esophagus
Stomach
Small and large intestine
Salivary glands
Liver
Gallbladder
Pancreas