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Oxygen supply-aerobic cellular respiration-muscle exercise

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

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If oxygen from myoglobin or hemoglobin is scanty for the energy supply of muscle cell the cell then begins to do lactic fermentation in an attempt to compensate deficiency.

Lactic fermentation liberates lactic acid and this substance causes muscle fatigue and predisposes muscles to the cramps.

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