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Digestive System
 
The digestive system includes the digestive tract and various supportive structures and accessory glands.  The tract begins at the oral cavity with the teeth and tongue.  The salivary glands release saliva into the mouth to moisten food for swallowing.  The tract continues down the throat to the esophagus, through the cardiac sphincter, and into the stomachAcid and digestive enzymes are added to the food to produce chyme.  The chyme passes through the pyloric sphincter to enter the small intestine.  Digestive enzymes from the pancreas and bile from the liver are added to the chyme.  The process of digestion and absorption are completed in the small intestine.  Wastes are carried through the ileoceccal valve into the large intestine.  The wastes are moved to the rectum, from where they can be expelled through the anus.

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