Anaerobic respiration and fatigue

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  • anaerobic respiration= incomplete breakdown of glucose to release energy
    • much less energy released per molecule of glucose than aerobic respiration
    • doesn't use oxygen
      • can supply energy to muscles where there is not enough oxygen for aerobic respiration
    • in muscle cells, produces lactic acid
      • blood flowing through muscles then removes the lactic acid
    • creates oxygen debt: the amount of oxygen required to oxidise lactic acid to carbon dioxide and water after exercise
    • After long periods of physical activity, muscles stop contracting well
    • Caused by build up of lactic acid in muscles


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