| Date | November 2021 | Marks available | 3 | Reference code | 21N.2.HL:.tz0.5 |
| Level | Higher Level | Paper | Paper 2 | Time zone | time zone 0 |
| Command term | Analyse | Question number | 5 | Adapted from | N/A |
Question
Analyse how the dominant energy system contributes to adenosine triphosphate (ATP) production during an indoor 60 m sprint.
Markscheme
ATP-CP is the dominant system;
fuelled by CP stores;
ATP production is achieved anaerobically;
one CP yields one ATP;
creatine kinase is the controlling enzyme;
there is enough ATP stored in the muscles <for the initial 2–3 seconds of activity/sprint is short in duration>;
Examiners report
A number of candidates were able to identify the relevant energy system and the fuel. Very few candidates provided sufficient points to be credited 3 marks. Further review and understanding of the energy system would be beneficial.
