CanFitPro Personal Training Specialist Practice Test

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What is the primary function of muscle spindles?

  1. Detect changes in muscle tension

  2. Provide information about muscle length and rate of change in length

  3. Supply nutrients to muscle fibers

  4. Produce muscle cells

The correct answer is: Provide information about muscle length and rate of change in length

Muscle spindles are sensory receptors found in muscles that provide information about muscle length and the rate at which the muscle is changing in length. This helps the brain to know the position of the limb in space and adjust voluntary movements accordingly. Option A is incorrect because muscle spindles do not directly detect changes in muscle tension, but they indirectly provide information about it through the length and rate of change in length. Option C is incorrect because supplying nutrients to muscle fibers is the function of blood vessels, not muscle spindles. Option D is incorrect because muscle spindles do not produce muscle cells, they are simply sensory receptors within muscles.

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