When we work hard we suffer from muscle fatigue because muscle cells;

  • (A)

    Carry out aerobic respiration at faster rate and so are tired

  • (B)

    Carry out anaerobic respiration and so accumulate more CO2

  • (C)

    Carry out anaerobic respiration and so accumulate lactic acid

  • (D)

    Carry out aerobic respiration and so accumulate lactic acid

    ;
Correct Answer: C