The "all-or-none principle" states that in a given muscle, all of the cells are contracting simultaneously or none of them is contracting.

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The "all-or-none principle" applies to individual muscle fibers or neurons, not entire muscles. It means that a single muscle fiber or neuron will fully contract or not at all, depending on whether the stimulus reaches the threshold.

The "All-Or-None Principle" States That in a Given Muscle, All