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1. DigestionDigestion of Carbohydrates  • It is the breakdown &   degradation of polysaccharides &   oligosaccharides into...
Classification of Carbohydrates                                           3         1  Digestible                        D...
TheDigestive System
PH 6.4 – 6.9. Activated  by Cl-, digests starch to           Acidic PH of stomach (1-2) is  dextrins, maltose &           ...
Carbohydrate Digestion in Small Intestine• Salivary amylase stops working in acidic  stomach (if pH  4.5)• 50% of dietary...
Carbohydrate Digestion  in Small Intestine
& Isomaltose
2. Absorption     Monosaccharides Absorption• Pentoses are absorbed by facilitated diffusion then  excreted through the ki...
Pentoses absorbed                       by Passive Diffusion                          According                         co...
Types of Transport Carriers
Monosaccharides AbsorptionLiver
GLUT1 in RBCs membrane is Facilitated Diffusion
Digestion of Lactose    (Lactase)
Lactose Intolerance• Some individuals (90% of adult blacks & Orientals)  have a defect in lactase enzyme• Undigested lacto...
Lactase deficiency
Fate of Absorbed Glucose• Glucose enter Liver & Brain by Passive  diffusion• Glucose enter other tissues (skeletal muscle,...
Utilization of Glucose       Anabolic       Reactions                    Catabolic                                    Reac...
4 digestion pdf
4 digestion pdf
4 digestion pdf
4 digestion pdf
4 digestion pdf
4 digestion pdf
4 digestion pdf
4 digestion pdf
4 digestion pdf
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4 digestion pdf

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Transcript of "4 digestion pdf"

  1. 1. 1. DigestionDigestion of Carbohydrates • It is the breakdown & degradation of polysaccharides & oligosaccharides into their simplest units (Monosaccharides)
  2. 2. Classification of Carbohydrates 3 1 Digestible Do not need digestion 2 Non-DigestibleStarch MonosaccharidesGlycogen Cellulose Pentoses Lactose Hexoses Sucrose
  3. 3. TheDigestive System
  4. 4. PH 6.4 – 6.9. Activated by Cl-, digests starch to Acidic PH of stomach (1-2) is dextrins, maltose & unsuitable for salivary isomaltose amylase 4. - (Activated by Cl ). 3. Brush border (Intestinal juice,Succus Entericus) containing:Maltase, Lactase & Sucrase
  5. 5. Carbohydrate Digestion in Small Intestine• Salivary amylase stops working in acidic stomach (if pH  4.5)• 50% of dietary starch digested before it reaches small intestine• Brush border enzymes act upon oligosaccharides, maltose, sucrose & lactose• lactose indigestible after age 4 in most humans (due to lack of lactase)
  6. 6. Carbohydrate Digestion in Small Intestine
  7. 7. & Isomaltose
  8. 8. 2. Absorption Monosaccharides Absorption• Pentoses are absorbed by facilitated diffusion then excreted through the kidney• Fructose is absorbed by facilitated diffusion then converted to glucose inside the cell• Sodium-glucose transport proteins (SGLT) in membrane help absorption of glucose & galactose
  9. 9. Pentoses absorbed by Passive Diffusion According concentration gradient Hexoses absorbed by Active Transport Against concentration gradientAbsorption of Pentoses & Hexoses
  10. 10. Types of Transport Carriers
  11. 11. Monosaccharides AbsorptionLiver
  12. 12. GLUT1 in RBCs membrane is Facilitated Diffusion
  13. 13. Digestion of Lactose (Lactase)
  14. 14. Lactose Intolerance• Some individuals (90% of adult blacks & Orientals) have a defect in lactase enzyme• Undigested lactose (osmotically active compound) passes to the bowel (large intestine), acted upon by bacteria of large intestine producing short chain fatty acids & CO2 gas, leading to: 1. Abdominal distention (cramping) 2. Abdominal pain 3. Nausea 4. Bloating 5. Watery diarrhea
  15. 15. Lactase deficiency
  16. 16. Fate of Absorbed Glucose• Glucose enter Liver & Brain by Passive diffusion• Glucose enter other tissues (skeletal muscle, adipose tissue, etc…) by Active transport• Active transport is enhanced by Insulin
  17. 17. Utilization of Glucose Anabolic Reactions Catabolic Reactions1) Storage in the form of Glycogen (Glycogenesis)2) Storage in the form of Lipid 1) Glycolysis (Lipogenesis) 2) Kreb’s Cycle3) Synthesis of sugar alcohols 3) Pentose Shunt and amino sugars 4) Formation of4) Interconversion between monosaccharides Uronic acids
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