What happens when action potentials stimulate a muscle at a rate that does NOT allow relaxation between individual action potentials?

Question

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When action potentials stimulate a muscle at a rate that does not allow relaxation between individual action potentials, summation occurs, leading to an increase in the strength of contraction with subsequent stimuli. This eventually reaches a steady plateau, known as tetanus.

What Happens When Action Potentials Stimulate a Muscle at a Rate