NUTR 4320 Study Guide - Winter 2019, Comprehensive Midterm Notes - Small Intestine, Large Intestine, Weaning
13 Feb 2019
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Gross folds (kerchkring folds: 8mm projections (lots in duodenum and fewer in the jejunum) which increase surface area, 2. Villi (millions - 1 mm projections: increase surface area by another 10 fold, 3. Microvilli: on each cell (enterocyte/epithelial cells, have 1000 microvilli (1 micrometer, increases surface area by another 20 fold, total: ~surface area = 250m2 = tennis court. Apical border: on epithelial cells, basolateral on bottom facing lamina propria: enterocyte or intestinal epithelial cell (iec) barrier: single cell barrier that protects the rest of the body from anything in the external environment (the lumen) small intestine/colon. Iec: intestinal epithelial cell *dont use this acronym on tests. & adherence junctions (hold two epithelial cells tight together so nothing from lumen of intestine cannot squeeze between cells into lamina propria into bloodstream into body) Goblet cells: produce and secrete mucus and form mucus layer that covers epithelial boarder. 4, layers of the small intestine: 1.
