In the digestive system enzymes break down large insoluble molecules (e.g. starch, proteins and fats) into small soluble molecules that can be absorbed into the blood from the small intestines.

Large Insoluble Molecule
Type of Enzyme
Small Soluble Product
Carbohydrate (e.g. Starch)
Carbohydrase
Simple Sugars (e.g. glucose)
Protein
Protease (e.g. pepsin)
Amino Acids
Fat/Lipids
Lipase
Glycerol and Fatty Acids
You can learn more about the role of enzymes in digestion in the Digestion topic