Final answer:
The predominant supplier of ATP for a 5-second sprint is the creatine phosphate system, which is the primary source of energy for short bursts of high-intensity activity such as sprinting.
Step-by-step explanation:
The predominant supplier of ATP for a 5 second sprint is the creatine phosphate system. Creatine phosphate can supply energy at a very high rate and is the primary source for short, intense exertion such as a sprint, lasting for about 8-10 seconds. After creatine phosphate stores are depleted, the muscles begin to use glycolysis to continue the production of ATP. Glycolysis breaks down glucose anaerobically, but the rate of ATP production is slower compared to creatine phosphate, making it a secondary source for sprints that extend beyond the initial 5 seconds.