Explain aerobic cellular respiration during muscle exercise, Biology

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What happens when the oxygen supply is insufficient to maintain aerobic cellular respiration during muscle exercise?

If oxygen from hemoglobin or myoglobin is not enough for the energy supply of the muscle cell the cell then begins to do lactic fermentation in an attempt to compensate the deficiency.

The lactic fermentation releases lactic acid and this substance causes muscle fatigue and predisposes the muscles to cramps.

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