Parts of Digestive Syste1

Parts of Digestive Syste1 - Parts of Digestive System

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Parts of Digestive System mouth/teeth  - for chewing (mastication)  sharp teeth in carnivores for cutting flat teeth in herbivores for grinding both types in omnivore saliva - mucous solution o makes food easier to swallow o contains amylase >> breaks down starch into disaccharide epiglottis prevents food from entering respiratory tract esophagus  - 1/3 skeletal muscle, 2/3 smooth muscle  peristalsis - rhythmic waves of muscle contraction cardiac sphincter - ring of smooth muscle preventing food in stomach from coming back into esophagus stomach  - sac part of digestive tract  can expand due to folds on interior extra layer of smooth muscle for churning food, mixing w/ gastric juice o parietal cells - secrete hydrochloric acid, intrinsic factor (for red blood cells) o chief cells - secrete pepsinogen (weak protease) only proteins digested in stomach kills most of bacteria w/ acid, survivors go on to live in large intestine
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Parts of Digestive Syste1 - Parts of Digestive System

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