Outline the efficiency of ATP production in the ATP-PCr system. (4 marks)
--- 12 WORK AREA LINES (style=lined) ---
Show Answers Only
Sample Answer
- The ATP-PCr system produces ATP more rapidly than any other energy system, providing immediate energy for explosive movements without requiring oxygen.
- Each phosphocreatine molecule yields one ATP molecule through direct phosphate transfer, making it a 1:1 conversion ratio.
- This system operates at maximum efficiency for 10-15 seconds before PCr stores deplete.
- Muscles contain limited phosphocreatine reserves that exceed ATP stores but exhaust quickly during maximal effort.
- The system’s efficiency enables ATP regeneration within milliseconds due to PCr being stored directly in muscle cells.
- Despite its speed advantage, the system’s efficiency is limited by total capacity, providing only enough energy for brief maximal efforts like jumps or sprint starts.
Show Worked Solution
Sample Answer
- The ATP-PCr system produces ATP more rapidly than any other energy system, providing immediate energy for explosive movements without requiring oxygen.
- Each phosphocreatine molecule yields one ATP molecule through direct phosphate transfer, making it a 1:1 conversion ratio.
- This system operates at maximum efficiency for 10-15 seconds before PCr stores deplete.
- Muscles contain limited phosphocreatine reserves that exceed ATP stores but exhaust quickly during maximal effort.
- The system’s efficiency enables ATP regeneration within milliseconds due to PCr being stored directly in muscle cells.
- Despite its speed advantage, the system’s efficiency is limited by total capacity, providing only enough energy for brief maximal efforts like jumps or sprint starts.