6.10 - Absorption

• Adaptations of villi in the ileum that aid digestion ?

  • Increased SA for diff
  • Thin walls
  • Muscular so can move, maintains conc grads
  • Good blood supply
  • Have microvilli, increase SA
• Describe the absorption of triglycerides ?

  • Micelles are transported to epithelial cell lining
  • they breakdown to release fatty acids and monoglycerides (non-polar so diffuse easily)
  • FA + mg transported to ER and recombine into triglycerides
  • In Golgi apparatus, triglycerides associate with cholesterol and lipoproteins to form chylomicrons
  • Move out of cell by exocytosis
  • Enter lymphatic capillaries called lacteals then pass into blood