DASC20010 Lecture Notes - Lecture 21: Ileocecal Valve, Tight Junction, Motilin

• School: University of Melbourne
• Department: Animal Science
• Course: DASC20010
• Professor: Peter Cakebread

Document Summary

Learning objectives: small intestine epithelial structure and function, digestion & absorption of carbohydrates, protein & fat, water & electrolyte absorption, overview of large intestine function, absorption of fermentative products across rumen epithelium in herbivores. Small intestine epithelium: circular folds of the small intestine mucosa: collectively increase the surface area threefold, villus: microscopic fingerlike projection, microvilli- increase surface area. 20 fold: surface area- good for absorption- increases secretions. Small intestine digestion: only well broken down material can be absorbed, one final breakdown product- membrane bound digestive enzymes sitting on lining of cells- important in breaking down molecules into smaller molecules- tight junctions between them- leaky. Mechanism: dietary polysaccharides starch and glycogen are converted into the disaccharide maltose through the action of salivary and pancreatic amylase, maltose, lactose and sucrose- converted into the monomers, monosaccharides glucose and galactose absorbed into epithelial cells by. Digestion & absorption of protein: protein- broken down by.