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NASM Personal Trainer

Category - Sciences

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The action that the muscle spindle has on the muscle when excited is which of the following?

The muscle fibers relax
The muscle fibers contract
The muscle is lengthened
The muscle produces force

Explanation

Answer - B - When excited, the muscle spindle causes the muscle fibers to contract. This is because the spindles are sensitive to change in length and rate of length change.

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