the anaerobic glycolytic system Flashcards
what is the anaerobic glycolytic system also known as?
the short-term lactate anaerobic system
what does the anaerobic glycolytic system do?
provides energy for high-intensity exercise for longer than the ATP-PC system
how long does this system last?
it is dependant on the fitness of the individual & how high the intensity is
how long does the system last at lower intensities?
2-3 minutes as demand for energy is slightly less
how does the anaerobic glycolytic system re-synthesise ATP?
from the breakdown of the fuel glucose
what is fuel glucose supplied from?
the digestion of carbohydrates
it is stored in the muscles & liver as glycogen is readily available
how does the system work to provide energy?
when PC stores are low the enzyme ‘glycogen phosphorylase’ is activated to break down the glycogen into glucose
what is the glucose then broken down into?
pyruvic acid by the enzyme ‘phosphofructokinase’
-this process is called anaerobic glycolysis
where does anaerobic glycolysis take place?
in the sarcoplasm of the muscle cell where oxygen is unavailable
-as this is an anaerobic process the pyruvic acid is further broken down into lactic acid by the enzyme ‘lactate dehydrogenase’ (LDH)
what happens during anaerobic glycolysis?
energy is released to allow ATP re-synthesis
what is the ATP result from anaerobic glycolysis?
2 molecules of ATP produced for one molecule of glucose broken down
how long can the anaerobic glycolytic system last?
up to 3 minutes for high-intensity exercise
can peak at 45 seconds
advantages of anaerobic glycolytic system:
1) ATP can be re-synthesised quickly due to few chemical reactions
2) lasts longer than the ATP-PC system
3) in the presence of oxygen lactic acid can be converted back to liver glycogen/used as fuel through oxidation into CO2 and water
4) can be used for a sprint finish
disadvantages of the anaerobic glycolytic system:
1) lactic acid is the by-product
2) accumulation of acid in the body de-natures enzymes and prevents them increasing rate at which chemical reactions take place
3) only a small amount of energy can be released from glycogen under anaerobic conditions
