At its natural resting length, a muscle is close to its optimal length for produ

Question

At its natural resting length, a muscle is close to its optimal length for producing force. As the muscle contracts, the maximum force it can deliver decreases. When a muscle is at approximately 80% of its natural length, it cannot contract much more and the force it can produce drops drastically- For a muscle stretched beyond its natural length, the same is true. At about 120% of its natural length, the force that a muscle can exert again drops drastically. This muscle length to force relationship can be demonstrated by doing a chin-up. As you hang from the bar, your biceps muscles are stretched and can produce only a relatively small force. As you get close to the bar. your biceps muscles contract substantially, and you again experience difficulty. The easiest part of the chin-up occurs somewhere in between, when your muscles are close to their natural length. Imagine hanging from a chin-up bar and beginning a chin-up. Which of the following velocity versus time graphs best represents the first part of your motion (from being at rest to being approximately halfway to the bar)? Assume you are trying to do the chin-up as quickly as possible.

Explanation / Answer

C)

Because initially it is difficult to move very fast as his length is close to 120%. But as he moves up his muscles work better and moves rapidly.

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