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Paper 4Theory (Extended)3 marks
A student measures their heart rate before and after running for 5 minutes.
Description
Heart Rate and Physical Activity
The student records their heart rate at rest and immediately after running. The heart rate increases from 70 beats per minute (bpm) at rest to 120 bpm after running.
| Condition | Heart Rate (bpm) |
|---|---|
| Rest | 70 |
| After running | 120 |
- a[3]
Explain why the heart rate increases during physical activity.
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