During anaerobic cell metabolism, athletes sometimes complain of short-term muscle fatigue. what can be causing this fatigue? check all that apply.

The likely cause of this fatigue are:

Lactic acid accumulating in the muscle. Accumulated lactic acid will force the muscle cells within our body to enter resting period so it could rebuild itself. This condition will cause a fatigue for the athlete
Acidity in muscle cells increases potassium loss from muscles, which will also cause a fatigue for the athlete 

Major sources of stress, such as a death or divorce, problems in family relationships, job loss, school, and substance abuse, can trigger or aggravate some mental disorders in some people. but not everyone who goes through those things develops a mental illness

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