The Human Gas Exchange System and Breathing - Complete KS3 Biology Lesson Pack

Everything you need to teach the human gas exchange system and breathing at KS3 — two complete resources, full answer keys, and no preparation required. This lesson pack covers the airways, the diaphragm and intercostal muscles, and how pressure and volume move air, for students aged 11-14. 🫁

The gas exchange system is the group of organs that work together so you can breathe. It is also called the respiratory system.

📦 The main worksheet contains 16 questions worth 100 marks across three progressive sections: multiple choice, true or false and a word bank summary (30 marks); key term definitions, a parts table and written explanations (40 marks); and extended answers including the bell jar model and a common misconception (30 marks). The extension pack provides four enrichment activities — vocabulary matching (12 marks), a challenge quiz with a data table (25 marks), an iron lung case study (20 marks) and a Teach It Back guide assessed with a rubric. Full answer keys are included for everything. Everything comes as a PDF and an editable Word file (DOCX).

🖥️ Full lesson page with the video, quiz and free worksheet: https://inewittall.com/ks3-biology/the-human-gas-exchange-system-and-breathing/?utm_source=payhip&utm_medium=listing

▶️ Watch the full lesson on YouTube: https://youtu.be/tj1iZkWPUW8

💰 Buying this bundle saves £1 compared to purchasing both resources separately (£3 + £3 = £6 individually, £5 as a pack).

WHAT'S INCLUDED:

MAIN WORKSHEET:

- 16 questions, 100 marks total

- Section 1: Knowledge recall (30 marks) — 5 multiple choice questions, a 10-statement true or false table, a 10-gap word bank summary

- Section 2: Application and understanding (40 marks) — key term definitions, a parts table, written explanations of pressure and breathing

- Section 3: Extension and analysis (30 marks) — extended answers on breathing out, the bell jar model and a common misconception

- Full answer key with detailed marking guidance

EXTENSION PACK:

- 4 activities: Vocabulary matching (12 marks), Challenge quiz with data table (25 marks), Iron lung case study (20 marks), Teach It Back (rubric-assessed)

- Full answer keys for all activities

FILE FORMATS:

- PDF and editable Word file (DOCX) for every resource

KS3 Biology

Lesson Pack

Bundle

Complete Resource

worksheet

extension pack

gas exchange system

respiratory system

breathing

diaphragm

intercostal muscles

air pressure

bell jar model