Which enzyme breaks down creatine phosphate in the ATP-PC system?

Which enzyme breaks down creatine phosphate in the ATP-PC system?

• A. Creatine kinase
• B. Hexokinase
• C. Phosphofructokinase
• D. Citrate synthase

Answer: (A)

In the ATP-PC system, energy is rapidly regenerated by transferring a phosphate group from creatine phosphate to ADP to form ATP. The enzyme that does this transfer is creatine kinase, enabling a quick rise in ATP during short, high-intensity efforts. The other enzymes are part of different pathways: hexokinase starts glycolysis by phosphorylating glucose, phosphofructokinase is a key control point in glycolysis, and citrate synthase kicks off the citric acid cycle. So, the enzyme that enables the immediate ATP replenish in this system is creatine kinase.

In the ATP-PC system, energy is rapidly regenerated by transferring a phosphate group from creatine phosphate to ADP to form ATP. The enzyme that does this transfer is creatine kinase, enabling a quick rise in ATP during short, high-intensity efforts. The other enzymes are part of different pathways: hexokinase starts glycolysis by phosphorylating glucose, phosphofructokinase is a key control point in glycolysis, and citrate synthase kicks off the citric acid cycle. So, the enzyme that enables the immediate ATP replenish in this system is creatine kinase.