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Aerobic cellular respiration

What occurs when the oxygen supply is inadequate to maintain aerobic cellular respiration throughout muscle exercise?

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When oxygen from myoglobin or hemoglobin is not sufficient for the energy supply of muscle cell, the cell then starts to do lactic fermentation in an attempt to compensate the shortage. The lactic fermentation liberates lactic acid and this substance causes muscle fatigue and predisposes the muscles to cramps.

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