Chemical digestion
Core
• State the significance of chemical digestion in
the alimentary canal in producing small, soluble
molecules that can be absorbed
• State where, in the alimentary canal, amylase,
protease and lipase enzymes are secreted
• State the functions of a typical amylase, a
protease and a lipase, listing the substrate and
end-products
Chemical digestion in the alimentary canal turns large insoluble molecules into smaller water soluble molecules by breaking them down with enzymes in the mouth, stomach and small intestine.
Amylase is secreted in the mouth and small intestine
Protease is secreted in the stomach and small intestine
Lipase is secreted in the small intestine
Protease may turn a protein into amino acids
Lipase may turn a fat into fatty acids and glycerol
Amylase may turn Starch into maltose
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