Scientists studied mice that could not make phosphocreatine. The mean time to fatigue during intense exercise was measured.
| Group | Mean time to fatigue / s |
|---|---|
| Normal mice | 120 |
| Mice unable to make phosphocreatine | 45 |
Describe the effect of being unable to make phosphocreatine on the time to fatigue.
[2]
Explain this result using the role of phosphocreatine.
[3]
Suggest why the effect is greatest during short, intense exercise.
[1]