The quickest way to provide ATP to working muscles is through anaerobic glycolysis.
As each glucose molecule yields two ATP, glycolysis offers a direct method of generating energy in the absence of oxygen. Anaerobic glycolysis is the term used to describe the process of breaking down glucose without the presence of oxygen.
One 6 carbon glucose molecule undergoes glycolysis in the cytoplasm, where it is oxidised to produce two 3 carbon pyruvate molecules.
Pyruvate's fate is determined by whether or not the cells have mitochondria and oxygen.
The requirement to regenerate ATP is critical because the muscles' finite supply of ATP is consumed during muscle activity very quickly.
The molecule creatine phosphate is one method by which this ATP supply is renewed (or phosphocreatine).
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