# How do your muscles continue to get energy during high levels of activity when there is not enough oxygen?

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Nov 2, 2017

In case of some strenuous activity;

• muscle cells break down glucose(present in glycogen) anaerobically to provide required $A T P$. In this case lactic acid is produced as a product.

• $A T P$ is also provided by another energy storing compound called creatine phosphate.

Remeber:
Muscle cells are differentiated from other cells in having large amount of stored glycogen and a lot of mitochondria . In low supply of oxygen, muscle cells start to break down glucose anaerobically(in the absence of oxygen). As a result of this respiration, lactic acid is deposited in the muscles. And excess deposition of lactic acid cause muscle fatigue.

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