• Amylase breaks down starch into simple reducing sugars
  Found in saliva, produced in pancreas and secreted into duodenum
  
• Protease breaks down protein into amino acids
  Found in gastric juice of stomach, produced in pancreas and secreted into duodenum
  
• Lipase breaks down fats and oils into fatty acids and glycerol
  Produced in pancreas and secreted into duodenum

The breakdown of starch:

• Amylase breaks down starch into maltose in saliva, from pancreas
• Maltase breaks down maltose into glucose at the membranes of the epithelium lining the small intestine

The breakdown of protein:

• Pepsin breaks down protein in acidic stomach
• Trypsin breaks down protein in alkaline small intestine