BIOL 030 Lecture Notes - Lecture 17: Duodenojejunal Flexure, Colic Flexures, Lesser Omentum
17 May 2020
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Digestive system divided into digestive tract and accessory organs. Fxn ingest, physically & chemically breakdown food, nutrient storage, water absorption. Digestive tract fig 26. 1, long tube from mouth to anus gastrointestinal tract. Incisors 8, flat front teeth, nip food: cuspids 4, canines, pointed, shear food, have one point, bicuspids 8, premolars, grind food, lateral to cuspids, have two cusps, molars 12, most posterior, grind food, three to five cusps. Pharynx area of swallowing, moves food from mouth to esophagus. Esophagus moves food from pharynx through diaphragm into stomach. Upper 1/3 skeletal m, middle 1/3 both, lower 1/3 smooth m: esophogeal sphincter prevents backflow of acid from stomach to esophagus. Anal canal short tube leads to external opening (anus) Anus external opening, inferior end of gi tract: internal & external anal sphincters s 2,3,4. Layers of walls of gi tract: mucosa, epithelium. Accessory organs: liver produces bile, stores & moves nutrients, detoxification, secretes albumin, lobes fig 26. 17.
