If spindles are described as becoming loose during movement, what does this imply?

• A. They are less taut, allowing Length Monitoring
• B. They Become More Taut
• C. They Stop Functioning
• D. They Fatigue Rapidly

Answer: (A)

The main idea is that muscle spindles sense the length of a muscle and how quickly that length is changing. As movement occurs and the muscle changes length, the spindle’s tension adjusts. If the spindle is described as becoming loose, it means it is less taut. This looser state allows the spindle to continue providing accurate information about the actual muscle length as it changes, rather than resisting or masking those changes. In other words, the spindle remains able to monitor length during movement, which is its job. That’s why the option stating they are less taut, allowing Length Monitoring, is the best choice.

If spindles became more taut, they might overly bias signals or affect sensitivity; stopping functioning would contradict the idea of ongoing feedback during movement; fatigue isn’t the direct implication of a looser spindle during movement.