Digestion and Absorption

• Proteases

  Endopeptidase - break peptide bond within molecule - produces 2 shorte rpolypepteides Exopeptidases - hydrolyse edge of polypeptide chains to produce 1 amino acid and a shorter chain Dipeptidase - hydrolyse dipeptides into 2 amino acids
• Describe how digested ttiglycerides are absorbed and transoprted to the ileum and lymphatic system (5)

  1 - micelles made from bile salts, fatty acids and monoglycerides

  2- mielles carry fatty acids to epithelial cells of ieum

  3 - fatty acids absorbed into cells of ileum by simple diffusion through PL bilayer (soluble)

  4 - Triglycerides or chylomicrons are formed

  5 - vesicales are removed by exocytosis into lymph vessel
• Role / Importance of Micelles

  1 - Micelles include bile salts and fatty acids

  2 - make the fatty acids more soluble in water

  3 - bring/ carry/ release fatty acids to cell lining of ileum

  4 - maintain higher conc of fatty acids to cell / lining of ileum

  5 - fatty acids absorbed by simple diffusion
• Why are lipid droplts and micelels important

  1 droplets increae surface area for lipase enzyme action

  2 so faster hydrolysis / digestion of triglycerides

  3 micelles carry fatty acids and glycerol to /through the ileum membrane to intestinl epithelial cell
• Role of golgi body in lipid absorption

  Processes / modifies triglycerides and combines triglycerides with ptoteins packaged for release / exocytosis / by forming vesicles