Science · Year 6

Active learning ideas

Circulatory and Respiratory Systems

Students best grasp how two complex systems interact when they see, touch, and measure the systems in real time. Active learning lets Year 6 learners feel the pulse, build the pathways, and watch air move, turning abstract diagrams into lived experience. These hands-on tasks make it possible for every student to connect structure to function before we move to abstract explanations.

• ACARA Content Descriptions
• ACARA Australian Curriculum v9: Science Year 5, Biological sciences, describe the key function of the respiratory and circulatory systems in a range of animals, including humans (AC9S5U02)
• ACARA Australian Curriculum v9: Science Year 6, Science Inquiry, use a range of representations, including tables, graphs and models, to represent and summarise data from students’ own investigations and secondary sources (AC9S6I05)

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

Activity 01

• Role Play
• 25 min · Small Groups

Demonstration: Balloon Lung Model

Use a plastic bottle, balloons, and straws to represent lungs and trachea. Students pull a balloon diaphragm to inhale air, watching lung balloons expand, then release to exhale. Groups record observations and discuss how alveoli enable gas exchange.

Compare the functions of the circulatory and respiratory systems in maintaining life.

Facilitation Tip

During the Balloon Lung Model, ask students to mark the diaphragm position on the cup so they can see how downward movement creates negative pressure that draws the balloon ‘lungs’ open.

What to look for

Provide students with a diagram of the heart and lungs. Ask them to label key parts and write one sentence explaining how oxygen moves from the lungs to the body and how carbon dioxide returns. Include a question: 'What is one way exercise helps your heart work better?'

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

Activity 02

• Progettazione (Reggio Investigation)
• 35 min · Pairs

Progettazione (Reggio Investigation): Pulse Rate Challenge

Students measure resting heart rate at wrist or neck for one minute. Perform jumping jacks for two minutes, then remeasure and compare in pairs. Class compiles data to graph averages and discuss exercise impacts.

Explain how oxygen is transported from the lungs to the rest of the body.

Facilitation Tip

When running the Pulse Rate Challenge, have students work in pairs so one can count while the other records, reducing counting errors and increasing accountability.

What to look for

Ask students to stand up and take 5 deep breaths, counting their breaths. Then, have them do 30 seconds of jumping jacks and immediately count their breaths again. Ask: 'What did you observe about your breathing rate before and after exercise? Why do you think this happened?'

• Understand
• Apply
• Analyze
• Self-Awareness
• Social Awareness
• Relationship Skills

Activity 03

• Role Play
• 40 min · Small Groups

Model Building: Straw Circulation Circuit

Connect wide straws as arteries, thin ones as capillaries, and flexible tubes as veins into a loop. Use a syringe as the heart to pump dyed water, observing flow differences. Adjust straw sizes to predict and test efficiency.

Predict the impact of regular exercise on the efficiency of these systems.

Facilitation Tip

While building the Straw Circulation Circuit, pause after each section to ask students to predict which colour tube represents the artery and which the vein before they add the next connector.

What to look for

Pose the question: 'Imagine you are explaining to someone why both your lungs and your heart are essential for staying alive. What are the main jobs of each system, and how do they work together?' Facilitate a class discussion, encouraging students to use key vocabulary.

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

Activity 04

• Simulation Game
• 30 min · Whole Class

Simulation Game: Whole Class Relay

Assign roles: heart, lungs, body cells. Pass beanbag 'oxygen' from lungs to cells via 'blood' runners, timing relays with and without obstacles to mimic exercise. Debrief on system coordination.

Compare the functions of the circulatory and respiratory systems in maintaining life.

What to look for

Provide students with a diagram of the heart and lungs. Ask them to label key parts and write one sentence explaining how oxygen moves from the lungs to the body and how carbon dioxide returns. Include a question: 'What is one way exercise helps your heart work better?'

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

A few notes on teaching this unit

Teach these systems as one continuous story rather than two separate topics. Begin with the body’s need for oxygen, then immediately show how the respiratory system gathers it and the circulatory system delivers it. Avoid front-loading too much vocabulary; introduce terms only when students need them to explain what they see. Research shows that students learn anatomy best when they manipulate models before labeling them, so let observations lead the terminology.

By the end of these sessions, students should be able to trace oxygen from air to alveoli, through the heart, and into body tissues, naming key parts and explaining one cycle. They will use data from their own bodies to justify how exercise changes heart and breathing rates, and they will build a working model that correctly shows circulation direction.

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Watch Out for These Misconceptions

• During the Straw Circulation Circuit, watch for students who colour veins blue and arteries red and call both ‘blue blood’ and ‘red blood’ interchangeably.

  Have students pause and use the red food-colouring syringe for oxygen-rich blood and the blue for oxygen-poor blood. Ask them to trace the path aloud while they hold the tubes, confirming that colour changes only when blood passes through the ‘lungs’ (the cotton-ball filter) and not because of the tube colour itself.

• During the Pulse Rate Challenge, watch for students who describe the heart as ‘stopping’ between beats when they feel their pulse disappear for a split second.

  Remind students to keep their fingers on the pulse point while you time 15 seconds with a timer. Ask them to count the beats they actually feel, not the gaps, highlighting that the heart is always moving—pause only means slower, not stopped.

• During the Balloon Lung Model, watch for students who push the balloon ‘diaphragm’ outward, mimicking inhalation by inflating the lungs directly.

  Provide a second small balloon taped inside the first to represent lung tissue. Ask students to pull the outer balloon down and note that the inner balloon inflates without being touched, showing that muscles change pressure, not directly push air into the lungs.

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Methods used in this brief

• Role Play
• Progettazione (Reggio Investigation)
• Simulation Game