We get tired after exercise because our muscle fibers get tired very quickly. This is due to the major source of energy for the muscle tissue, called adenosine triphosphate, or ATP. As the muscles make use of this supply of energy, they get tired and fatigue.
DWI i believe. I know that's the charge they give you. I should know XD
Answer:
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Explanation:
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If it cannot perform basic or normal tasks is has reached an unsafe level of fatigue