Anaerobic respiration
Why?
Without oxygen, cells release a little energy from glucose by anaerobic respiration, making lactic acid in muscles or alcohol and carbon dioxide in yeast.
In a sprint, muscle cells run short of oxygen, lactic acid builds up as red dots and the legs begin to burn.
Press the button to see muscles and yeast respire without oxygen.
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Yeast in a sealed bottle of fruit juice makes bubbles of carbon dioxide that inflate a balloon on top.
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