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    'When you are being physically active your muscle cells need more oxygen and glucose and you heart muscle cells need more oxygen and fatty acids'. Do the muscle cells always mostly respire glucose or does it only do this under increased physical activity? Why does the heart respire fatty acids under increased activity?
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    All cells need glucose including muscle and heart cells. Fatty acids release more energy compared to glucose and hence are preferred during increased physical activity.
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    (Original post by alleycat393)
    All cells need glucose including muscle and heart cells. Fatty acids release more energy compared to glucose and hence are preferred during increased physical activity.
    Could it also be because the muscle cells under increased activity need short bursts of energy which glucose can provide (as it's smaller) and fatty acids take longer to respire but release alot of energy. Fatty acids also can not be respired anaerobically unlike glucose and the heart can not risk undergoing anaerobic respiration as this would end up delivering this toxic lactic acid to many cells, and this would be hard to 'clean up' as well. The heart muscles activity probably also doesn't need to be increased THAT much so it doesn't need the 'short bursts of energy', but it still is a hard working organ so needs a lot of energy just not that quickly hence fatty acids are used. What do you think? Does this sound right?
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    I think it has more to do with the amount of energy required and produced by eithe glucose or fatty acids rather than the amount of time it takes to burn either.
 
 
 
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