MUSCLE NERVE CARTILAGE BONE
GANGLIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Adjusts length of muscle spindle so that it reports how much contraction has taken place
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Adjusts length of muscle spindle so that it reports force
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Adjusts length of muscle spindle so that it reports length
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Adjusts the output of the reflex
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Detailed explanation-1: -Gamma motor neurons regulate the gain of the stretch reflex by adjusting the level of tension in the intrafusal muscle fibers of the muscle spindle . This mechanism sets the baseline level of activity in motor neurons and helps to regulate muscle length and tone.
Detailed explanation-2: -Stimulation of these motor neurons induces contraction or shortening of the muscle fibers. Alpha motor neurons induce the contraction of extrafusal muscle fibers upon stimulation, whereas gamma motor neurons induce the contraction of intrafusal muscle fibers upon stimulation.
Detailed explanation-3: -Efferent stimulation of the spindle by gamma motor neurons contracts the myofibrils, tautening the central region of spindle-which maintains the muscle spindle’s sensitivity to muscle’s length change. Without gamma motor neurons, muscle spindles would be very loose as the muscle contracts more.