Last%2018 - Last Lecture GI Tract-mouth salivary glands...

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Last Lecture! GI Tract -mouth, salivary glands, upper esophageal sphincter, esophagus, lower esophageal sphincter, stomach, pyloric sphincter, (on the side: liver + gallbladder, pancreas), small intestine, ileocecal sphincter, large intestine, rectum/anus small intestine -3 parts: duodenum, jejunum, ileum -duodenum: receives chime from stomach as well as bile and pancreatic juice -has stretch receptors, has chemoreceptors that respond to a decrease in pH, sugars, amino acids, fatty acids -jejunum: has a large surface area that is good for absorption, some digestion -3 ways to increase surface area: large folds, villi, microvillli Function of Saliva -softening (adds water), lubricating (mucus) -contains lysozymes (break down bacterial walls, and salivary amylase (starts to break down starch) Swallowing is a reflex: you push food towards the pharynx, the upper esophageal sphincter relaxes, and you swallow -esophageal sphincters are closed except when we swallow Movement in GI tract: 1)
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