39. In experimental preparations, activation of the corticospinal tract can result in excitation of both a- and y-motoneurons. The co-activation of a- and y-motoneurons confers which of the following advantages compared with activation of only a-motoneurons? A) Decreased tension in the intrafusal muscle fibers increases the force of muscle contraction. B) Inhibition of y-motoneurons is overcome by activity in recurrent collaterals of a-motor axons C) y-Motoneuron axon collaterals excite a-motoneurons, increasing their total activity D) Muscle spindles shorten, preventing an unloading effect on muscle spindle sensory endings

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