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Summary of the digestion process Mouth Digestive juice produced Saliva Stomach Gastric juice Small intestine Pancreatic juice from the pancreas Enzymes in the juice Salivary amylase Pepsin Renin Trypsin Chymotrypsin Amylase Lipase Substance acted on Starch Substances produced Maltose Proteins (e.g milk protein) Proteins Peptides Starch Fats Notes Slightly alkaline or neutral. Saliva helps lubricate food. 0.5% hydrochloric acid conditions for pepsin and kills most bacteria. Absorption of alcohol and some water soluble vitamins. Peptides and Amino acids Maltose Fatty acid and Glycerol Bile emulsifies fats and aids its digestion. Bile from liver Intestinal Juice Fats Peptidase Lipase Peptides Fats Maltase Sucrase Maltose Sucrose Amino acids Fatty acids and Glycerol Intestinal juice is secreted by cells in the duodenum and ileum. Most absorption of sugars, amino acids, fatty acids, vitamins and minerals occurs in the ileum. Glucose Glucose and Fructose Glucose and Galactose Lactase Colon None © Food – a fact of life 2009 Lactose Dietary fibre Free fatty acids Gases Breakdown of dietary fibre by bacteria. Production of B12 and vitamin K by bacteria. Some absorption of water takes place in the colon.