Enzymes are part of the (Chemical or Mechanical) digestion process. Their function is to break down (Macromolecules, Atoms, or Vitamins). Amylase is a digestive enzyme secreted (In the stomach by the gallbladder, in the mouth and by the pancreas, or in the small intestine and by the liver) and is responsible for breaking down (Lipids, Nucleic acids, Starch, Proteins) .