Circulation & Breathing Together
Understand how the circulatory and respiratory systems work together: the lungs oxygenate the blood, the heart pumps it around the body, cells use the oxygen and produce carbon dioxide waste, and the blood carries the waste back to the lungs to be breathed out
Teaching approaches
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1 approach
Can your child explain why their heart beats faster when they run — and how their heart and lungs are working together to deliver more oxygen to their muscles?
Understand how the circulatory and respiratory systems work together: the lungs oxygenate the blood, the heart pumps it around the body, cells use the oxygen and produce carbon dioxide waste, and the blood carries the waste back to the lungs to be breathed out
Learning resources
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This concept
Check understanding
- Describe the cycle: lungs add oxygen to blood → heart pumps oxygenated blood to body → cells use oxygen → blood returns CO₂ to lungs
- Explain why heart rate and breathing rate increase during exercise (muscles need more oxygen)
- Measure their own resting and post-exercise heart rate and explain the difference
“Can your child explain why their heart beats faster when they run — and how their heart and lungs are working together to deliver more oxygen to their muscles?”
Curriculum record
- Type
- Conceptual
- Subject
- Science
- Domain
- The Human Body
- Age range
- Ages 9–11