A scientist places a strip of bird flight muscle in a nutrient solution containing glucose. The muscle is stimulated to contract at a constant rate for 10 minutes. The glucose concentration remains high enough throughout.
The table shows results from the first and final two minutes.
| Time interval in minutes | Mean dissolved oxygen concentration in mg dm⁻³ | Glucose used in μmol | ATP supplied in μmol |
|---|---|---|---|
| 0 to 2 | 8.0 | 0.20 | 6.0 |
| 8 to 10 | 0.40 | 3.0 | 6.0 |
Calculate how many times greater the amount of glucose used from 8 to 10 minutes was than from 0 to 2 minutes.
Explain why the muscle used more glucose from 8 to 10 minutes even though the amount of ATP supplied was unchanged.
State the substance that would accumulate in the muscle from 8 to 10 minutes.
98 exam-style questions on Edexcel GCSE Biology 8.3 Respiration, covering 8.3.1 Aerobic and anaerobic respiration. Each one has a worked solution and a mark scheme showing where the marks go.