This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
During exercise, the most rapid way to synthesize ATP is: 
Select and explain. 
A. Glycogenolysis, B. Glycolysis, C. TCA cycle, D. Creatine phosphate
D: Creatine phosphate
Answer: D: Creatine phosphate 
Explanation: Ans. d. Creatine phosphate.The high group transfer potential of ATP enables it to act as a donor of high-energy phosphate compounds. There are three major sources of high phosphate compounds taking pa in energy conservation i.e. oxidative phosphorylation, glycolysis, and citric acid cycle.Phosphagens act as storage forms of group transfer potential and include creatine phosphate, which occurs in veebrate skeletal muscle, hea, spermatozoa, and brain, and arginine phosphate, which occurs in the inveebrate muscle.