Question

The all-or-none law of muscle contraction refers to a maximum contraction or no contraction of a ..........

Answer 1

The all or none law states that the strength by which a nerve or muscle fiber responds to a stimulus that is independent of the strength of the stimulus. If that stimulus exceeds the threshold potential, the nerve or muscle fiber will give a complete response, otherwise, there is no response.

So, the correct answer is 'muscle fiber'.