A rower completed a short, vigorous trial. Before the trial, the rower’s resting oxygen uptake rate was 0.40 dm³ per minute.
The table shows the mean oxygen uptake rate during consecutive 30-second intervals after the trial.
| Time after trial in seconds | Mean oxygen uptake rate in dm³ per minute |
|---|---|
| 0–30 | 3.20 |
| 30–60 | 2.40 |
| 60–90 | 1.60 |
| 90–120 | 0.80 |
After 120 seconds, the oxygen uptake rate returned to the resting rate.
Calculate the oxygen debt produced by the trial.
Give your answer in dm³.
Explain why the rower’s oxygen uptake rate remained above the resting rate after the trial.
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.