digestive system

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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