HTHSCI 1H06 Lecture Notes - Lecture 8: Facilitated Diffusion, Muscular Layer, Thoracic Duct
8 Jan 2015
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Document Summary
Blood supply to the intestines: celiac artery: supplies duodenum, superior mesenteric artery: supplies jejunum, ileum and first segment of li. Inferior mesenteric artery: supplies half of the transverse colon (cid:0) to anus (last distal 1/3 of. Specialized glands secrete bicarb rich mucus to protect duodenum. Pancreatic duct and bile duct dump into descending portion (duodenum) via. Jejunum (40%: thick wall, wide lumen, denser mucosa, lots of absorption. Smallest diameter: most food stuff is absorbed. Few mucosal folds: ends at ileocecal valve, transition from chime to feces. Villi of small intestine: help increase surface area for absorption, helps to mix chime with digestive enzymes, blood capillaries absorb nutrients into the, lacteals brings lymphatic fluid back blood. How we absorb fats; fats are dumped into lymphatic system (cid:0) left thoracic duct (cid:0) liver to be processed. Since it goes all around your body before being processed, this is why the fats can do harmful things to your body: histology, columnar epithelial cells.
