Final answer:
The ATP-Phosphocreatine system supplies energy to muscles during intense activity lasting about 10 seconds.
Explanation:
The ATP-Phosphocreatine system supplies energy to muscles during intense activity lasting about 10 seconds. Creatine phosphate can provide energy for a short duration, typically up to 10-20 seconds, before other energy systems need to take over. This system is crucial for quick bursts of energy required during activities like sprinting.
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