🔬 Science · The Human Body
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
Typical age: 9–11 years
“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?”
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