While our bodies can store glucose (for example, that's what marathoners are doing when they eat lots of pasta the night before a race), we can't store oxygen. Sometimes we can't take in enough oxygen to keep up with our energy needs. When this happens, our muscle cells switch to anaerobic respiration -- instead of reacting with oxygen, the glucose breaks in half and forms lactic acid. Energy is produced, but the lactic acid builds up in our muscles. This build-up makes our muscles feel heavy and they might even cramp up.
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While our bodies can store glucose (for example, that's what marathoners are doing when they eat lots of pasta the night before a race), we can't store oxygen. Sometimes we can't take in enough oxygen to keep up with our energy needs. When this happens, our muscle cells switch to anaerobic respiration -- instead of reacting with oxygen, the glucose breaks in half and forms lactic acid. Energy is produced, but the lactic acid builds up in our muscles. This build-up makes our muscles feel heavy and they might even cramp up.
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ANAEROBI RESPIRATION TAKES PLACE WHEN THER IS NO OXYGEN