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Circulation & Breathing Together

CONCEPTUAL
Science›The Human Body|Ages 9—11|ID: mt_QK-ZZb7UUN

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

Mastery Evidence

  • 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

Assessment Prompt

“Can [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?”

Prerequisites2

Show full prerequisite tree
  • Heart & Blood Circulation hard

    System interaction requires detailed knowledge of the circulatory system

    • Cells, Tissues & Organs hard

      Understanding 4-chamber heart requires knowing organs work within organ systems

      • The Heart & Blood soft

        Cells-to-systems hierarchy helps organise knowledge of heart as an organ in a system

      • The Brain Controls the Body soft

        Cells-to-systems hierarchy helps organise knowledge of brain as an organ in a system

      • How Breathing Works soft

        Cells-to-systems hierarchy helps organise knowledge of lungs as organs in a system

    • The Heart & Blood hard

      Detailed circulatory system builds on knowing the heart pumps blood through blood vessels

  • How the Lungs Work hard

    System interaction requires detailed knowledge of the respiratory system

    • Cells, Tissues & Organs hard

      Understanding alveoli and gas exchange requires knowing the cells-to-systems hierarchy

      • The Heart & Blood soft

        Cells-to-systems hierarchy helps organise knowledge of heart as an organ in a system

      • The Brain Controls the Body soft

        Cells-to-systems hierarchy helps organise knowledge of brain as an organ in a system

      • How Breathing Works soft

        Cells-to-systems hierarchy helps organise knowledge of lungs as organs in a system

    • How Breathing Works hard

      Detailed respiratory system builds on knowing we breathe air into lungs for oxygen

Unlocks1