How Does A Muscle Spindle Sense Muscle Stretch When The Muscle Is Shortened?

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How Does A Muscle Spindle Sense Muscle Stretch When The Muscle Is Shortened?

A. There is no effect of muscle shortening on spindle activity. The length of the muscle does not affect the spindle. B. Intrafusal fibers actively shorten the spindle to maintain the same relative length. C. It doesn't. Muscle spindles are not active when the muscle is shortened. D. Spring-like structures in the spindle cause the spindle to recoil as the muscle shortens keeping it the same relative length as the muscle.
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B

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