You will learn
- Name the parts.
- Describe breathing.
- Explain gas exchange.
- Explain lung health.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
Words to know
the windpipe
tiny air sacs in the lungs
a muscle under the lungs that helps breathing
swapping oxygen for carbon dioxide
1. Discover: The lung model
Using a bottle, a balloon and a rubber sheet, Fatima makes a lung model. When she pulls the sheet down, the balloon inflates. “The diaphragm moves down and air rushes in,” she says.
Think: What happens when the diaphragm relaxes?
2. Understand: Breathing
Idea 1: The path
Air enters the nose or mouth, passes down the trachea, into the bronchi and then the lungs, which contain millions of alveoli.
Idea 2: Breathing
When the diaphragm contracts and moves down and the ribs lift, the chest gets bigger and air flows in. When they relax, air flows out.
Idea 3: Gas exchange
In the alveoli, oxygen diffuses into the blood and carbon dioxide diffuses out. This is gas exchange.
3. Worked examples
Example 1 (I show you): Order
Air path.
- Nose.
- Trachea.
- Lungs.
Answer: In order.
Example 2 (We do it together): Explain
- Diaphragm down.
- Chest larger.
- Air in.
Answer: Pressure change.
Example 3 (You try): Explain
Exchange.
Show the steps and answer
- Oxygen in.
- CO2 out.
- Alveoli.
Answer: Diffusion.
Did you know?
The total surface area of the alveoli is roughly the size of a tennis court.
Why this matters
Healthy lungs supply the oxygen all our cells need.
4. Explore: Lung model
Build a lung model from a clear plastic bottle with the bottom cut off (by an adult), a balloon and a balloon stretched over the open end, and pull to inflate.
- Prepare the bottle.
- Fit the balloon inside.
- Cover the base.
- Pull and watch.
Think about it: what did you notice?
What did you notice? The balloon inflated when the sheet was pulled.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- The ___ is the windpipe.
- ___ are tiny air sacs.
- The ___ is a muscle under the lungs.
- ___ exchange swaps oxygen and carbon dioxide.
Guided practice
Question 1. What is the trachea?
Windpipe.
Question 2. What are alveoli?
Air sacs.
Question 3. What is the diaphragm?
Muscle.
Independent practice
Level 1: Start
- What is the trachea?
- What are alveoli?
- What is the diaphragm?
- What is gas exchange?
- What harms lungs?
Level 2: Grow
- Why many alveoli?
- Why diaphragm?
- Why avoid smoke?
Level 3: Stretch
- Build the model.
- Label.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain how we breathe in.
Show a sample answer
Use the diaphragm.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: We breathe out more.
Fix: Spongy tissue.
8. Lesson summary and revision card
- I can name the parts.
- I can describe breathing.
- I can explain gas exchange.
- I can explain lung health.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- Air travels through the trachea to the lungs.
- Oxygen enters blood in the alveoli.
- The diaphragm helps pull air in.
- Smoke and pollution harm lungs.
11. Next lesson
Next lesson: The circulatory system. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Define alveoli and gas exchange. [2 marks]
- Describe breathing in. [3 marks]
- Explain how to look after lungs. [3 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- Diaphragm down [1]; ribs up [1]; air in [1]
- No smoke [1]; exercise [1]; clean air [1]
- Any [1]; reason [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is the trachea?
- What are alveoli?
- What is the diaphragm?
- What is gas exchange?
- What harms lungs?
- Why many alveoli?
- Why diaphragm?
- Why avoid smoke?
- Build the model.
- Label.
Homework
Measure how many breaths you take in one minute at rest.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is the trachea? | Windpipe. | 1 |
| 2. What are alveoli? | Air sacs. | 1 |
| 3. What is the diaphragm? | Muscle. | 1 |
| 4. What is gas exchange? | Swap. | 1 |
| 5. What harms lungs? | Smoke. | 1 |
| 6. Why many alveoli? | Surface area. | 1 |
| 7. Why diaphragm? | Changes volume. | 1 |
| 8. Why avoid smoke? | Damages lungs. | 1 |
| 9. Build the model. | Photo. | 1 |
| 10. Label. | Diagram. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Windpipe.; 2 Air sacs.; 3 Muscle.; 4 Swap.; 5 Smoke.. Level 2: 1 Surface area.; 2 Changes volume.; 3 Damages lungs.. Level 3: 1 Photo.; 2 Diagram.; 3 Sentence..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Name the parts | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Describe breathing | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Explain gas exchange | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Explain lung health | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “We breathe in carbon dioxide.” We breathe out more.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain breathing.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child studies breathing. You do not need to be an expert to help.
- Feel your chest rise.
- Ask “What is happening?”
- Go outdoors for fresh air.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: name the parts; describe breathing; explain gas exchange; explain lung health.
Prerequisite knowledge. Grade 5 ideas: the main organs, the senses, healthy eating and keeping the body healthy.
Materials. Bottle, balloons, tape. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Adult cuts bottles.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Ask learners to hold breath for 5 seconds and ask, “Why did you need to breathe?”
Explanation (10 min). Teach breathing.
Guided activity (10 min). Learners model.
Independent activity (10 min). Learners explain.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. What moves? Which gas goes where?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “We breathe in carbon dioxide.” We breathe out more.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Explain breathing. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 6 Unit 4, topic 3; Next Generation Science Standards, structure and function in organisms; Cambridge Lower Secondary Science, human biology; IB Primary Years Programme, who we are. These sources informed the lesson.