These are bounded opportunities, not learner attainment. Partial and blocked source requirements remain so.

• partial: 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

  Own resting/post-exercise measurement clause blocked: fictional arithmetic is not a learner’s bodily observation. No personal exercise or medical recommendation.

• partial: Describe the cycle: lungs add oxygen to blood → heart pumps oxygenated blood to body → cells use oxygen → blood returns CO₂ to lungs

  Own resting/post-exercise measurement clause blocked: fictional arithmetic is not a learner’s bodily observation. No personal exercise or medical recommendation.

• partial: Explain why heart rate and breathing rate increase during exercise (muscles need more oxygen)

  Own resting/post-exercise measurement clause blocked: fictional arithmetic is not a learner’s bodily observation. No personal exercise or medical recommendation.

• blocked: Measure their own resting and post-exercise heart rate and explain the difference

  No own-body measurement conducted or required; fictional counts are labelled and separate.

• partial: Can {{name}} 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?

  Own resting/post-exercise measurement clause blocked: fictional arithmetic is not a learner’s bodily observation. No personal exercise or medical recommendation.

• Own resting/post-exercise measurement clause blocked: fictional arithmetic is not a learner’s bodily observation. No personal exercise or medical recommendation.