Energy Systems Flashcards
1
Q
How does energy manifest in the body?
A
- Movement
- Cell function
- Maintenance of life
2
Q
What is the function of myofibrillar ATPase? Where is it? And why is it important?
A
- Catalyses ATP hydrolysis
- At head of myosin molecule
- Stored energy only lasts 2s
- ATP needed to realise myosin from actin
3
Q
What is the ATP-PC reaction?
A
PCr + ADP + H+ -> ATP + Cr
4
Q
What is the oxidative phosphorylation pathway?
A
Substrate + ADP + O2 -> ATP + CO2
5
Q
Explain the ATP yield of the lactic acid system.
A
- Glycolysis turns glucose to pyruvate
- Requires 2 ATP to kickstart, but yields 4 ATP
- Balance is a gain of 2 ATP per pyruvate molecule
6
Q
What are the key points about NAD
A
- Exists as NAD+ and NADH
- Is a coenzyme
- Transports electrons
7
Q
What happens to pyruvate after glycolysis?
A
- Turns to Acetyl CoA with O2 to enter Krebs cycle
- Turns to lactate without O2
8
Q
What does the Krebs cycle do?
A
- Produces little energy but lots of coenzymes
- Pyruvate enters as acetyl CoA
- 2 cycles per 1 glucose
9
Q
Describe the CHO, FFA, aerobic power figure.
A
- Relationship between intensity and utilisation is present
- At rest mainly fat provides energy
- As intensity increases, CHO use increases fat use decreases
10
Q
What is the importance of athletes utilising more fat.
A
- Preserves glycogen
- For use later on in the race for sprints
