FOOD 2150 Lecture Notes - Lecture 4: Pancreatic Lipase Family, Portal Vein, Lactose Intolerance
4 Dec 2018
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Document Summary
Monosaccharides and amino acids are absorbed by epithelial cells and then transported by by the portal vein to the liver where it undergoes first pass metabolism. When lipids transported through cell are transported by the lymphatic system, which allowes the liver to be by-passed. Microvilli increase absorption and epithelial cells of microvilli secret mucus to avoid self- digestion). Salivary amylase breaks down glycemic carbohydrates into maltose and dextrins. Salivary amylase does not hydrolyize into glycemic carbohydrates individual monosaccharides; this happens at brush boarder. Lactase becomes dormant as you older (i. e. lactose intolerance), you do not need to reply on lactose as an energy source, and we don"t produce lactase. Therefore it cannot get across the epithelial cells (it was not broken down beyond the disaccharide), and it ferments in the colon. Pancreatic amylases and brush boarder enzymes, reduce the length of carbohydrate polymers. Amylose is reduced to dextrins long chains, less than 10 monosaccharides.
