The main immediate source of ATP (lasting about 10 seconds)as muscle contractions begin comes from:

Name: The main immediate source of ATP (lasting about 10 seconds)as muscle contractions begin comes from:
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Creatine phosphate is used to rapidly generate ATP for the first few seconds of muscle contractions. Glucose and glycogen are used for ATP production after creatine phosphate stores are depleted, but this takes longer than 10 seconds. Fat is not a direct source of ATP for muscle contractions.

The Main Immediate Source of ATP (Lasting About 10 Seconds)as