Cambridge IGCSE Biology
7.4Chemical digestion
Chemical digestion in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic20 practice questions1 lesson
Learning objectives
What the syllabus expects you to be able to do.
- 7.4.1Describe chemical digestion and its role in producing small soluble molecules that can be absorbed.
- 7.4.2Describe the functions of amylase, proteases and lipase, and state where each is secreted and where it acts.
- 7.4.3Describe the functions of hydrochloric acid in gastric juice.
- 7.4.4Supplement: describe the digestion of starch by amylase and maltase and of protein by pepsin and trypsin, and explain how bile neutralises the acidic mixture entering the duodenum.
Lessons
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Chemical digestion and digestive enzymes
18 min
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Sample question
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