A mountain rescue trainee completes a hard exercise by dragging a weighted sledge up a slope.
The trainee's resting oxygen uptake is 0.30 dm³ per minute.
The table shows the trainee's mean oxygen uptake rate during the first 3 minutes after the exercise.
| Time after exercise in seconds | Mean oxygen uptake rate in dm³ per minute |
|---|---|
| 0–30 | 2.40 |
| 30–60 | 1.80 |
| 60–90 | 1.40 |
| 90–120 | 1.00 |
| 120–150 | 0.70 |
| 150–180 | 0.50 |
Calculate the extra oxygen taken up above the resting level during the 3-minute recovery period.
Give your answer in dm³.
Explain why the value calculated in part (a) is likely to be lower than the trainee's total oxygen debt.
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.