This exam focus covers Exam Focus within The Human Digestive System for GCSE Biology. Structure and function of digestive organs, mechanical and chemical digestion, enzymes, absorption, and practical investigations It is section 12 of 15 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 12 of 15
Practice
19 questions
Recall
24 flashcards
Exam Focus
Very Frequently ExaminedThe digestive system is one of the highest-yield topics in AQA Paper 1. It connects directly to the enzymes topic (Topic 10) and appears in questions worth 2–6 marks. Key question patterns include:
- Adaptation questions (3–4 marks): "Explain how the small intestine is adapted for absorption" — always give structural feature AND explain how it increases absorption rate.
- Role of bile questions (2–3 marks): "Describe the role of bile in fat digestion" — state it emulsifies fat (not digests), and explain that this increases surface area for lipase.
- Enzyme location questions (1–2 marks): Know where each enzyme acts (mouth: amylase; stomach: pepsin/protease; small intestine: amylase, lipase, protease from pancreas).
- 6-mark extended response: May ask you to "describe the digestion and absorption of carbohydrates from mouth to bloodstream" — practise writing this as a flowing account, not a bullet list.
Common mark-losing errors: Saying bile is an enzyme; saying digestion occurs mainly in the stomach; confusing the large and small intestine roles; forgetting lacteals for fat absorption.