End Products of Intestinal Extracellular Digestion
Carbohydrates
Maltose: Fig 19.13
Dissacharides ---> monosaccharides by brush border dissacharidases
Monosaccharides absorbed by Na+ - dependent symport
Peptide Absorption by Intestine
• Peptides ---> dipeptides
• Dipeptides ---> amino acids by brush border dipeptidases
• Amino acids absorbed by symport (Na+ - dependent)
• Note: essential amino acids
Lipid Absorption by Intestine
Lipids ---> fatty acids and absorbed passively
Intestinal epithelial cells ---> triglycerides
Triglycerides ---> chylomicrons ----> released into blood
Some fatty acids carried by albumin
A Bile Salt: Fig 19.16
Emulsification by Bile Salt: Fig 19.16: Lipase Action
Enterohepatic Circulation: Fig 19.19
Absorption of Fats: Fig 19.20