Vigorous exercise will cause muscle fatigue which is primarily due to

Options

A. a sodium and potassium imbalance
B. the accumulation of carbon dioxide
C. the accumulation of lactic acid
D. the accumulation of ADP

Answer

C

Explanation

The cause of muscle fatigue is said to be the accumulated anaerobically produced lactic acid. lactic acid may later be broken down into carbon dioxide and water for elimination, or it may be converted into glycogen and stored for future use.