If you continue to increase the firing rate (of action potentials) of a motor neuron, then all of the skeletal muscle fibers it innervates will eventually summate to tetanus.

Question

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When a motor neuron fires action potentials at higher frequencies, the skeletal muscle fibers it innervates will eventually reach a point where they are unable to relax completely before being stimulated again, resulting in sustained contraction and tetanus.

If You Continue to Increase the Firing Rate (Of Action