Which of the following is rapid source of energy by resynthesizing ATP for exercising muscles is?
Glycolysis
Glycogenolysis
TCA cycle
Phosphocreatine
Ans: A. Glycolysis(Ref Guyton 13/e p1087. Ganong 25/e p108, 24/e p106)Phosphocreatine:Rapid source of energy by resynthesizing ATP for exercising muscles.During periods of high activity, cycling of phosphorylcreatine allows for quick release of ATP to sustain muscle activity.