• Card 31 / 34: Which of the following is not true about motor unit recruitment?
    A) The brain stimulates an estimated amount of motor units to perform a movement.
    B) More motor units are recruited to perform movement in a smooth fashion.
    C) More and larger motor units are recruited to meet demands of higher resistance.
    D) When fast-glycolytic (Type IIb/x) fibers are recruited, fast-oxidative fibers (Type IIa) and slow-oxidative (Type Ia) fibers are also recruited.
    E) None of these. All are true about motor unit recruitment.

    Answer:
    E) None of these. All are true about motor unit recruitment.

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Explanation:

Skeletal muscle recruits motor neurons based on the level of force required. The muscle fibers of a motor unit respond to a threshold stimulus and the higher the stimulus, the more motor neurons are recruited. In the case of resistance training, higher resistance causes the recruitment of more motor neurons. Fast-glycolytic (Type IIb/x) fibers are recruited to move a heavy weight and are fueled by glycolytic respiration. Slow-oxidative (Type I) fibers are recruited at all times and are fueled by aerobic respiration. Type I fibers are in use through every muscle contraction and during light intensity exercise like jogging. Fast-oxidative (Type IIa) fibers are used between glycolytic and aerobic respiration, leaning more toward aerobic respiration for energy. These fibers are used in high-intensity interval training programs. When Type IIa fibers are recruited, Type I fibers are also recruited. When Type IIb/x fibers are recruited, so are both Type IIa and Type I fibers.

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ZOOL113 Muscular System

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