Which of the following is NOT true of muscle fatigue?

A. It may be caused by conduction failure, due to accumulation of K+ ions in the transverse tubules of skeletal muscle fibers
B. It usually occurs when a muscle is being stimulated during very light work or exercise.
C. It may be caused by decreased responsiveness of a muscle fiber to low pH, resulting from a build-up of lactic acid
D. It involves a decrease in the force of muscle contraction, even when the muscle is still under stimulation.
E. All of these are true of muscle fatigue.


Answer: B

Anatomy & Physiology

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