(1) Trypsin and chymotrypsin secreted by pancreas help in the digestion of proteins, lipase breaks fats into fatty acids and glycerol and amylase break sugars. All enzymes of pancreas act in an alkaline medium. Pepsin is produced by the stomach and it acts on proteins in an acidic medium. Salivary amylase is produced in the mouth and it breaks starches into sugars. Mucous does not have any enzyme.