1H Energy systems In Muscle Cells Flashcards
What is the purpose of creatine phosphate?
Breaks down to release energy and provide phosphate to convert ADP into ATP at a fast rate.
How long does the creatine phosphate system support strenuous exercise for?
10 seconds
Why is strenuous exercise not supported for longer?
The creatine phosphate supply runs out.
When is the creatine phosphate system restored?
When energy demands are low.
Describe the process of lactic acid metabolism.
- Glycolysis takes place as normal.
- H ions are removed from NAD and donated to pyruvate by dehydrogenase enzymes.
- Pyruvate is converted into lactic acid.
- NAD is regenerated to ensure the continuation of glycolysis.
Describe slow twitch muscles fibres.
Contract more slowly, can contract for longer and are good for endurance activities.
Name the respiratory pathways normally used by slow twitch fibres?
Glycolysis and aerobic pathways.
The number of mitochondria found in slow-twitch muscle fibres is?
Large.
The density of blood capillaries associates with the slow-twitch muscle fibres is?
High (to deliver more oxygen to respiring cells).
The concentration of myoglobin in slow-twitch is?
High.
The main storage fuels used by slow twitch muscles fibres is?
Fats.
Describe fast twitch muscles.
Contract more quickly, over short periods and are so good for burst of activity.
Name the respiratory pathways normally used by fast twitch muscle fibres?
Glycolysis only.
The number of mitochondria found in fast-twitch muscle fibres is?
Small
The density of blood capillaries associates with the fast twitch muscle fibres is?
Low (oxygen is not needed for Glycolysis)
