Science · Year 6

Active learning ideas

The Respiratory System: Breathing In and Out

Active learning lets students feel and see the mechanics of breathing, turning abstract processes into tactile experiences. When they build a model or measure their own breathing rates, the respiratory system moves from a diagram to a lived phenomenon.

• National Curriculum Attainment Targets
• KS2: Science - Animals, including humans

• 25–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Experiential Learning
• 30 min · Small Groups

Model Building: Balloon Lung Demo

Provide plastic bottles, balloons, and straws for students to assemble a lung model. One balloon acts as the diaphragm, another pair as lungs; pulling the diaphragm balloon expands the lung balloons to simulate inhalation. Groups test and record how volume changes affect air flow.

Explain how air enters and leaves the lungs during breathing.

Facilitation Tip

During the Balloon Lung Demo, circulate to ensure students attach the balloon correctly to the bottle base so the diaphragm simulation works smoothly.

What to look for

Students receive a card with a diagram of the lungs. Ask them to label the trachea, diaphragm, and alveoli. Then, ask them to write one sentence explaining what happens to the diaphragm during inhalation.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 02

• Experiential Learning
• 25 min · Pairs

Experiment: Exercise Breathing Rates

Students measure resting breathing rate for one minute using a stopwatch. Pairs then jog in place for two minutes and remeasure, graphing results to compare changes. Discuss why rates increase and link to oxygen needs.

Analyze the process of oxygen and carbon dioxide exchange in the alveoli.

Facilitation Tip

For the Exercise Breathing Rates experiment, set clear timing for each student’s run, and have timers ready to maintain consistency.

What to look for

Ask students to stand up and take 10 deep breaths, counting their breaths. Then, have them sit down and take 10 breaths. Ask: 'What did you notice about your breathing rate when you were standing versus sitting? Why do you think this happened?'

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 03

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Gas Exchange Stations

Set up stations: one with bubble solution to model alveoli diffusion, another with tea bags in water for gas exchange analogy, a third for pollution filters using tissue paper, and a discussion station. Groups rotate, noting observations.

Predict the impact of air pollution on respiratory health.

Facilitation Tip

At Gas Exchange Stations, assign small groups to rotate every three minutes so they experience each station fully without crowding.

What to look for

Pose the question: 'Imagine you are a doctor explaining to a patient why they cough more on a smoggy day. What would you say about how the air pollution affects their lungs and breathing?' Facilitate a class discussion where students share their explanations.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 04

• Experiential Learning
• 35 min · Whole Class

Prediction Challenge: Pollution Impact

Show images of polluted vs clean air; students predict effects on lungs using drawings. Test with simple filters on straws blowing into water, observing particle capture, then revise predictions.

Explain how air enters and leaves the lungs during breathing.

Facilitation Tip

In the Pollution Impact Prediction Challenge, provide images of polluted and clean air to ground student predictions in reality.

What to look for

Students receive a card with a diagram of the lungs. Ask them to label the trachea, diaphragm, and alveoli. Then, ask them to write one sentence explaining what happens to the diaphragm during inhalation.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

A few notes on teaching this unit

Use modeling to confront misconceptions early, especially about the diaphragm and constant air exchange. Research shows that students often visualize lungs as static containers, so physical models that show air flowing in and out correct this error faster than diagrams alone. Also, connect the mechanics to function by having students repeatedly link muscle contractions to gas movement before discussing diffusion.

Students will explain how air moves in and out of the lungs by linking diaphragm movement to pressure changes. They will also trace oxygen and carbon dioxide diffusion at the alveoli and connect exercise to increased breathing rates.

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Watch Out for These Misconceptions

• During the Balloon Lung Demo, watch for students who describe the balloon filling up and staying full.

  Have students repeatedly inflate and deflate the balloon while saying ‘air flows in’ and ‘air flows out’ to emphasize constant exchange, not storage.

• During the Exercise Breathing Rates experiment, watch for students who believe oxygen is used up completely in the body.

  Ask students to connect their rapid breathing after exercise to the need to restore oxygen supply, not to ‘use up’ oxygen permanently.

• During the Balloon Lung Demo with diaphragm palpation, watch for students who say breathing happens only in the chest.

  Guide students to place one hand on their belly to feel the diaphragm’s downward movement during inhalation, linking the internal muscle to the external model.

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Methods used in this brief

• Experiential Learning
• Stations Rotation