HUN 2000 Lecture Notes - Lecture 2: Microvillus, Gallbladder, Cholecystokinin

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Ase tells you it is an enzyme. Produces lysozyme (enzyme has anti- bacterial action) Peristaltic wave coordinated muscular contractions that move food down. Chyme: mix of partially digested food and gastric juice. Surface of stomach has mucosa (to protect stomach from acid) Larger meals take more time for the stomach to empty. * villi has tiny projections (microvilli & brush) Intestinal phase (passage of chyme into small intestine) Secretes bile and stored in gallbladder (bile aids in fat digestion) Secretin is released in response to chyme in small intestine. Released when fats and partially digested proteins enter small intestine. * stimulates contractions of the gallbladder to expel bile. *hepatic portal vein carries nutrients to the liver. *water soluble gets to the liver first. *nutrients absorbed in large intestine: water / some vitamins & minerals. Mouth / esophagus / stomach / 1st part of small intestine (duodenum)

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