Your Muscle Cells Can Ferment
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A cramp was possibly the consequence of Anaerobic Respiration. 
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When you exercise, your muscles require a lot of energy. 
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To get this energy, they convert enormous amounts of Glucose to ATP. 
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As you continue to exercise, your body doesn’t get enough oxygen to keep up with the demand in your muscles. This creates an oxygen debt. 
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Muscles switch over to Anaerobic Respiration. 
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Pyruvic acid produced from Glycolysis is converted to lactic acid.