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Exam Focus

Part of The Human Digestive System · GCSE GCSE Biology revision

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

22 questions

Recall

24 flashcards

Exam Focus

Very Frequently Examined

The 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.

Keep building this topic

Read this section alongside the surrounding pages in The Human Digestive System. That gives you the full topic sequence instead of a single isolated revision point.

Memory AidsExam TipsThe Body's Food Processing FactoryStructure of the Human Digestive System

Practice Questions for The Human Digestive System

Which organ produces hydrochloric acid to kill bacteria in food?

  • A. Liver
  • B. Stomach
  • C. Small intestine
  • D. Pancreas
1 markfoundation

Explain the role of bile in the digestive system.

3 marksstandard

Quick Recall Flashcards

What is peristalsis?
Peristalsis is the wave-like contractions of smooth muscle that push food through the digestive system. Circular muscles contract behind food while longitudinal muscles relax in front.
What are villi?
Villi are tiny finger-like projections on the wall of the small intestine that greatly increase the surface area for absorption of nutrients.

22 questions on The Human Digestive System — practise free

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