The main immediate source of ATP is creatine phosphate.
The answer is option b.
Creatine phosphate gives about the first 15 seconds of ATP at the beginning of muscle contraction.
Anaerobic glycolysis produces small amounts of ATP within the absence of oxygen for a quick duration. Aerobic metabolism makes use of oxygen to provide much greater ATP, permitting a muscle to work for longer intervals.
Few ATP is stored in a resting muscle. As contraction begins, it's far used up in seconds. More ATP is generated from creatine phosphate for about 15 seconds.
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