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Phys Chap 21 review

GI Tract

QuestionAnswer
Mucosa innermost layer of gastrointestinal tract
submucosa connective tissue / 2nd layer of GI tract
muscularis muscular layer of GI tract
serosa outer layer of GI tract
allows stomach to expand rugae
submucosa allows GI tract to stretch
masticate chew
Peritoneum lines abdominal cavity
visceral peritoneum covers serosa of GI tract
haustration happens in colon
segmentation happens in sm. Intestines
food + Gastric Juice chyme
neutralize chyme in sm. intestines 1st
chyme - acidic lots of H+
Sm. intestine juices cntain... lots of bicarbs to neutralize Chyme
Villi located in small intestines
micro-villi form brush border in small intestine
lacteals lymph capillaries in small intestines that collect dietary fats & transport them to CV system
Order of small intestine Duodnem, jejunum, illium
pepsin only acidic GI juice
segmentation mixing chyme w/ digestive juices in sm. intestines
peristalsis propel chyme down tube
lower esophageal sphincter between esophagus & stomach
pyloric sphincter between stomach & sm. intestine
Created by: goodbunn
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