IGCSE Biology / Food and digestion

Amylase, protease and lipase revision notes

Edexcel International GCSE Biology (4BI1), chapter 4: Food and digestion, specification point 2.29. Part of the full course.

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Amylase, protease and lipase break large food molecules into small, soluble products that can be absorbed. Knowing what each enzyme does, where it is made and where it works helps you understand digestion from the mouth to the small intestine.

More lessons in Food and digestion

• Carbohydrates, proteins and lipids
• Testing for starch, sugars, protein and fat
• The seven parts of a balanced diet
• What changes how much energy you need
• The parts of the digestive system
• Teeth, chewing and peristalsis
• Bile, the liver and emulsifying fat
• The villus and absorption
• Practical: measuring the energy in a food sample