Question

multiple choice question
what is a muscle twitch?
a sustained contraction of a muscle fiber due to prolonged stimulation.
the period of time during which the pulling force of a muscle is declining.
a single contraction of a muscle fiber in response to a single stimulation.
the period of time during which the pulling force of a muscle is increasing.
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Explanation:

A muscle twitch is defined as a single, brief contraction of a muscle fiber that occurs in response to a single nerve - impulse or stimulation. It is not a sustained contraction (which would be tetanus), nor is it related to the time periods of increasing or declining pulling force.

Answer:

A single contraction of a muscle fiber in response to a single stimulation.