Biology for IGCSE & O level - Respiration (Section 3 - No. 40)
What happens to the muscle cells during a period of strenuous exercise, when not enough oxygen is available?
Aerobic respiration begins.
Anaerobic respiration occurs.
Lactic acid builds up.
Carbon dioxide builds up.
Explanation
When not enough oxygen is available, anaerobic respiration is used, causing a build-up of lactic acid.
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