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absorption of food absorption of nutrients absorption of substances anatomy of the stomach crushing of food decomposition of food digestion process digestive process digestive system digestive tract food process gastric glands gastric juices human digestive system increase in saliva lipids and proteins mouth and esophagus muscular tunica muscular wall of the stomach pharynx and esophagus physical decomposition of foods salivary glands secrete saliva small intestine solution in water stomach and intestine structure of the stomach the abdomen the digestion tunica submucosa

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