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Chapter 29 Bowel Elimination•The gastrointestinal system is composed of: the mouth, pharynx,esophagus, stomach, liver, small intestine, large intestine, rectum andanus. Food is first chewed in the mouth where digestion begins by theenzymes found in saliva that break down food. Your tongue pushesthe food to pharynx where it is swallowed down the esophagus anddumped into the stomach. The stomach stores food while churningand mixing it so that the acids can further break down the food into aliquid called chyme. After about 4 hours, the chyme is then squeezedinto the small intestine. The liver and gallbladder release bile, whilethe pancreas releases enzymes, into the duodenum for digestion oflipids, proteins, and carbohydrates. The jejunum is the next portion ofthe small intestine where carbohydrates and proteins are absorbedinto the blood stream. The final part is the ileum, which connects thesmall intestine to the large intestine. This is responsible for theabsorption of fats; bile salts; and some vitamins, minerals, and water.