What does the term twitch refer to in muscle fibers?

Name: What does the term twitch refer to in muscle fibers?
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Twitch refers to the time it takes for a muscle fiber to contract and then relax. It is the smallest single movement that can be produced by a muscle fiber. This is in contrast to a tetanus, which is a sustained contraction produced by multiple twitches fused together. Options A, C, and D do not accurately describe the term twitch in this context.

What Does the Term Twitch Refer to in Muscle Fibers