Two participants, P and Q, pedal a cycle ergometer at the same power for 3 minutes. The resting oxygen uptake of each participant is 0.30 dm³ per minute.
Their oxygen uptake during recovery is shown in the table.
| Recovery interval | Oxygen uptake of P in dm³ | Oxygen uptake of Q in dm³ |
|---|---|---|
| 0–1 minute | 2.10 | 1.50 |
| 1–2 minutes | 1.40 | 0.90 |
| 2–3 minutes | 0.90 | 0.50 |
| 3–4 minutes | 0.60 | 0.30 |
| 4–5 minutes | 0.30 | 0.30 |
Calculate the oxygen debt of each participant during the 5 minutes of recovery.
Explain which participant was likely to have experienced greater muscle fatigue at the end of the exercise.
92 exam-style questions on AQA GCSE Biology 4.2 Respiration, covering 4.2.1 Aerobic and anaerobic respiration, 4.2.2 Response to exercise, and 4.2.3 Metabolism. Each one has a worked solution and a mark scheme showing where the marks go.