E2) ATP-PC system in exercise and sports performance

Question 1

Key facts

Answer 1

Anaerobic- no oxygen
In the sarcoplasm
Muscle store small amounts of ATP- can be used immediately
Replenish ATP quickly- muscle use CP
High energy- CP bond broken → creatine kinase
Energy released- transferred to ADP to resynthesise ATP
1ATP- resynthesised for each molecule of CP

Question 2

Steps

Answer 2

1. ATP
2. ATPase release on of the phosphates
3. Releases energy
4. Left with ADP
5. CP- separate with creatine kinase
6. Energy released attaches the phosphate to the ADP
7. Makes ATP

Question 3

Use in exercise

Answer 3

Lasts 10 seconds
High intensity- CP stores run out quickly
exercise intensity continues- PC stores will only partially replenish as not enough energy for creatine & phosphate to form creatine phosphate
work to rest ratio- determine how long it takes to replenish stores 1:10-12 (secs to recover)