BIOL 3324 Lecture Notes - Lecture 22: Paneth Cell, Intestinal Gland, Goblet Cell
17 Nov 2016
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Lecture 22: small intestine- digestion and absorption. Mucosal and submucosal (cid:498)tunics(cid:499) that project inwards. Increase surface area: increase surface area, increase absorptive abilities, have vascular and lymphatic vessels. Lacteal absorbs lipids and lipid soluble substances: villous absorptive cell, goblet cell, crypt of lieberkuhn secretion of intestinal juice. Undifferentiated crypt cell villous absorptive cell. Stem cell all cells: can have microvilli (cid:498)brush order(cid:499) proteins. Motility= mixing chyme, moving chyme, propelling contents to large intestine. Gastroileal reflex: food ileum cecum when food reaches stomach. Net absorption favors h2o, na, cl, k: cl, k, h2o follow na. Secretion favors hco3: accessory: liver, gallbladder, pancreas. Makes pancreatic juice to digest material: with digestive enzymes and hco3, basic and rich in protein. Acinar cells= make zymogens and enzymes: controlled by ach parasympathetic, peptide yy is inhibitor. Made in response to lipids: somatostatin is inhibitor. Duct cells= make bicarbonate: large intestine- final stage of absorption. Na actively absorbed, then cl and h2o follow.
