Science · Grade 5

Active learning ideas

Breathing Life: The Respiratory System

Active learning works for this topic because the respiratory system deals with dynamic processes that are hard to visualize through passive methods. Students need to experience airflow, pressure changes, and adaptations firsthand to internalize concepts like gas exchange and system efficiency.

• Ontario Curriculum Expectations
• 4-LS1-1

• 25–40 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Experiential Learning
• 35 min · Small Groups

Model Building: Balloon Lung System

Provide each small group with a clear plastic bottle, two balloons for lungs, a larger balloon for the diaphragm, straws, and tape. Students assemble the model, then pull the diaphragm balloon to inhale air into the lung balloons and release to exhale. Groups draw and label the model, noting how volume changes drive airflow.

Explain how the lungs facilitate the exchange of oxygen and carbon dioxide.

Facilitation Tip

During the Balloon Lung System activity, remind students that the balloon represents the lungs, not the entire system, to avoid oversimplification.

What to look for

Students draw a simple diagram of the lungs and label the path air takes. They then write one sentence explaining what happens at the alveoli.

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

Activity 02

• Experiential Learning
• 25 min · Pairs

Experiment: Breathing Rate Changes

In pairs, students use a stopwatch to count breaths per minute at rest, after 20 jumping jacks, and after recovery. They record data in tables and graph results. Pairs discuss why rates change and connect to oxygen demand.

Compare the respiratory systems of humans and other animals.

Facilitation Tip

While conducting the Breathing Rate Changes experiment, guide students to take consistent measurements by having them count breaths over the same 30-second intervals.

What to look for

Pose the question: 'Imagine you are a particle of dust. Describe your journey into the human body and what challenges you might face within the respiratory system.' Encourage students to use key vocabulary in their responses.

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

Activity 03

• Experiential Learning
• 30 min · Small Groups

Sorting: Animal Respiratory Adaptations

Small groups receive cards with animals, diagrams, and descriptions. They sort into categories like lungs, gills, or tracheae, then justify placements with evidence. Extend by sketching one adaptation and explaining its benefit.

Predict the impact of air pollution on the human respiratory system.

Facilitation Tip

For the Animal Respiratory Adaptations sorting task, provide real images or specimens to ensure students ground their comparisons in observable traits.

What to look for

Ask students to hold up one finger for 'yes' and two fingers for 'no' to answer true/false statements like: 'The diaphragm is a type of lung.' or 'Carbon dioxide moves from the blood into the lungs.'

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

Activity 04

• Simulation Game
• 40 min · Small Groups

Simulation Game: Pollution Impact Demo

Groups blow through coffee filters representing polluted air, timing how long to inflate a balloon versus clean air. They observe resistance differences and predict health effects. Class shares data to identify patterns.

Explain how the lungs facilitate the exchange of oxygen and carbon dioxide.

Facilitation Tip

In the Pollution Impact Demo, encourage students to record precise observations of changes in water clarity or plant health over time.

What to look for

Students draw a simple diagram of the lungs and label the path air takes. They then write one sentence explaining what happens at the alveoli.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

A few notes on teaching this unit

Teach this topic by starting with students' prior knowledge about breathing and then using models to correct misconceptions. Focus on the idea of continuous exchange rather than storage, and avoid overemphasizing the lungs as static organs. Research shows that hands-on modeling and real-world comparisons help students retain complex processes. Always tie activities back to the overarching concept of gas exchange and its role in supporting life.

Successful learning looks like students correctly explaining how air moves through the respiratory system, identifying adaptations across animals, and connecting structure to function in discussions. Students should also demonstrate an understanding of oxygen and carbon dioxide exchange through accurate modeling and data analysis.

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Watch Out for These Misconceptions

• During the Balloon Lung System activity, watch for students who describe the lungs as storing air like a balloon fills and empties.

  Pause the activity and ask students to measure the volume of air exhaled into a graduated cylinder filled with water to demonstrate that air moves through the system continuously rather than being stored.

• During the Animal Respiratory Adaptations sorting activity, watch for students who assume all animals breathe using lungs.

  Have students compare the physical features of gills, tracheae, and lungs side by side, prompting them to identify which structures are designed for extracting oxygen from water versus air.

• During the Breathing Rate Changes experiment, watch for students who believe exhaled air has the same oxygen content as inhaled air.

  Use a carbon dioxide indicator or a simple gas collection setup to show students the change in gas composition, then ask them to explain why oxygen levels decrease while carbon dioxide increases during exhalation.

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Methods used in this brief

• Experiential Learning
• Simulation Game