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Answer:  When the ATP–PC system begins to fade at around 10 seconds, the process of anaerobic glycolysis begins. This system breaks down liver and muscle glycogen stores without needing the presence of oxygen.

Explanation:  hope this helps!!!!

genewho

When glycogen is used without oxygen to produce ATP, such system is called lactic acid system.

Glycogen stored in muscle can be broken down into glucose (glycogenolysis), which will be processed by glycolysis.

This takes place in the cell cytoplasm without the presence of oxygen (anaerobiosis), generating modest amounts of ATP.

  • The final product is pyruvate that can be further processed in the mitochondria (aerobic system) with a high yield in the production of ATP.

  • Under optimal conditions, the lactic acid system can provide 1.3 - 1.6 minutes of peak muscle activity as an extension of the 8 to 10 seconds delivered by the phosphagen system.

Therefore, we can conclude that when glycogen is used without oxygen to produce ATP, such system is called lactic acid system.

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