Energy Systems - ATP-PC (A2) Flashcards
Make up of ATP
1 adenosine molecule
3 phosphate groups
Held together by chemical energy bonds
What is the only immediate source of energy in the body?
ATP
Where is the energy found in the ATP molecule?
In the bond between the final two molecules
Which enzyme breaks down the ATP molecule?
ATPase
Why is the ATP breakdown a coupled reaction?
It can be broken down and then resynthesised -> then broken down and resynthesised
What does the breakdown of ATP look like?
ATP -> ADP + P + Energy
What does the resynthesis of ATP look like?
ADP + P + Energy -> ATP
Duration and intensity of ATP-PC system
Short duration
High intensity
What type of reaction is the ATP-PC system?
Anaerobic
How long does the energy produced last for?
3 seconds
Which enzyme breaks down the phosphocreatine bond?
Creatine Kinase
How much energy is released during the PC breakdown?
Enough for resynthesis of 1 ATP molecule
Strengths of ATP-PC System
No O2 delay
PC readily available in muscle cell
No fatiguing by-product
Weaknesses of ATP-PC System
Low ATP yield
Small PC stores -> rapid fatigue after 8-10 seconds
