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SITE OF ACTION                  ENZYMES                                             FOOD Carbohydrate digestion  Starch &disaccharides  Mouth   Salivary amylase  Pancreatic amylase Sm. Intestine   Oligosaccharides & disaccharides   Brush border  enzymes in  Sm. Intestine Lactose Maltose Sucrose Galactose Glucose Fructose   ( dextrinase, glucoamylase,lactasem, maltase, and sucrase)  Carbohydrate absorption The monosaccharides glucose, galactose, and fructose enter the capillary blood in the villi & are transported to the liver. via the hepatic portal vein.
Protein digestion                              SITE OF ACTION                                     ENZYMES                                                          FOOD Protein Pepsin (stomach glands) in the presence of HCI    Stomach                                        Large polypeptides Pancreatic enzymes (trypsin, chymotrypsin, carboxypeptidase) Small intestine Small polypeptides Brush border enzymes (aminopeptidase, carboxypeptidase, and dipeptidase) Amino acids (some dipeptides and tripeptides) Protein absorption Amino acids enter the capillary blood in the villi and are transported to the liver via the hepatic portal vein.
SITE OF ACTION                                     ENZYMES                                                          FOOD Fat Digestion Unemulsified Fats Emulsifid by the detergent action of bile salts from the liver Small Intestine Pancreatic lipase Monoglycerides and fatty acids Glycerol and fatty acids Fat Absorption Fatty acids and monoglycerides enter the lacteals of the villi and are transported to the systemic circulation via the lymph in the thoracic duct. (Glyercol and short-chain fatty acids are absorbed into the capillary blood in the villi and transported to the liver via the hepatic portal vein.)

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Site of action

  • 1. SITE OF ACTION                  ENZYMES                                             FOOD Carbohydrate digestion Starch &disaccharides Mouth   Salivary amylase  Pancreatic amylase Sm. Intestine   Oligosaccharides & disaccharides   Brush border enzymes in  Sm. Intestine Lactose Maltose Sucrose Galactose Glucose Fructose   ( dextrinase, glucoamylase,lactasem, maltase, and sucrase) Carbohydrate absorption The monosaccharides glucose, galactose, and fructose enter the capillary blood in the villi & are transported to the liver. via the hepatic portal vein.
  • 2. Protein digestion                              SITE OF ACTION                                     ENZYMES                                                          FOOD Protein Pepsin (stomach glands) in the presence of HCI    Stomach                                       Large polypeptides Pancreatic enzymes (trypsin, chymotrypsin, carboxypeptidase) Small intestine Small polypeptides Brush border enzymes (aminopeptidase, carboxypeptidase, and dipeptidase) Amino acids (some dipeptides and tripeptides) Protein absorption Amino acids enter the capillary blood in the villi and are transported to the liver via the hepatic portal vein.
  • 3. SITE OF ACTION                                     ENZYMES                                                          FOOD Fat Digestion Unemulsified Fats Emulsifid by the detergent action of bile salts from the liver Small Intestine Pancreatic lipase Monoglycerides and fatty acids Glycerol and fatty acids Fat Absorption Fatty acids and monoglycerides enter the lacteals of the villi and are transported to the systemic circulation via the lymph in the thoracic duct. (Glyercol and short-chain fatty acids are absorbed into the capillary blood in the villi and transported to the liver via the hepatic portal vein.)