Does Aerobic Respiration Continue During Anaerobic Exercise?Watch
Think about it, if anaerobic respiration occurred, that suggests a lack of oxygen and so aerobic respiration cannot occur.
A cell cannot aerobically and anaerobically respire at the same time can it.
When you exercise, your muscles begin to undergo anaerobic respiration. But does aerobic respiration still go on (i.e. anaerobic just tops it up), or does it stop (i.e. anaerobic takes over)?
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Anaerobic respiration kicks in when aerobic respiration can't meet the metabolic demand of exercise. All 3 energy systems are used in different proportions for all kinds of activities.
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A cell will never have 0 oxygen. Under normal circumstances blood will still be flowing and oxygen will still be delivered. It will just not be enough and have to be supplemented. Remember how much more efficient aerobic is - it would make little sense for a cell desperate for energy to stop using it.