Q: What is the reason for fatigue caused by repeated muscle activation?  

Answer: D

The repeated activation of the muscles can cause fatigue due to a variety of reasons. One of the primary reasons is the buildup of lactic acid, which is a byproduct of anaerobic metabolism. When the muscles are repeatedly activated without sufficient oxygen, they switch to anaerobic metabolism, which results in the breakdown of glycogen. As a result, lactic acid accumulates in the muscle fibers and causes fatigue. This can be particularly problematic during intense or prolonged exercise, where the muscles are constantly being activated without sufficient oxygen to sustain aerobic metabolism. Other factors that can contribute to muscle fatigue include depletion of energy stores, such as ATP and glycogen, as well as accumulation of other metabolites like hydrogen ions and inorganic phosphate.

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