digestive system

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powerpoint presentation - the human digestive system * phases include ingestion movement mechanical and chemical digestion absorption elimination * types mechanical (physical) chew tear grind mash mix chemical enzymatic reactions to improve digestion of carbohydrates proteins lipids * gastrointestinal (gl) tract tube within a tube direct link/path between organs structures mouth pharynx esophagus stomach small intestine large intestine rectum * * teeth mechanically break down food into small pieces. tongue mixes food with saliva (contains amylase, which helps break down starch). epiglottis is a flap-like structure at the back of the throat that closes over the trachea preventing food from entering it. it is located in the pharynx. * approximately 20 cm long. functions include: secrete mucus moves food from the throat to the stomach using muscle movement called peristalsis if acid from the stomach gets in here that’s heartburn. * a good way to describe peristalsis is an ocean …

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t absorb rectum (short term storage which holds feces before it is expelled). * depending on the maturity of the group, you can talk about the feces leaving via the anus. mention the appendix at the bottom of the ascending colon and that it might have been used long ago but is not today mention the portions of the large intestine, ascending, transverse, descending, sigmoid, and rectum (last one if the audience is mature enough) functions bacterial digestion ferment carbohydrates absorbs more water concentrate wastes * not part of the path of food, but play a critical role. include: liver, gall bladder, and pancreas * directly affects digestion by producing bile bile helps digest fat filters out toxins and waste including drugs and alcohol and poisons. * * livers can regenerate missing pieces if necessary. is one of the largest organs in the body. stores bile from the liver, releases …

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powerpoint presentation - the human digestive system * phases include ingestion movement mechanical and chemical digestion absorption elimination * types mechanical (physical) chew tear grind mash mix chemical enzymatic reactions to improve digestion of carbohydrates proteins lipids * gastrointestinal (gl) tract tube within a tube direct link/path between organs structures mouth pharynx esophagus stomach small intestine large intestine rectum * * teeth mechanically break down food into small pieces. tongue mixes food with saliva (contains amylase, which helps break down starch). epiglottis is a flap-like structure at the back of the throat that closes over the trachea preventing food from entering it. it is located in the pharynx. * approximately 20 cm long. functions include: secrete mucu...

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