When a motor neuron of a particular motor unit is activated, all of the muscle fibers it innervates are stimulated to contract simultaneously.

Name: When a motor neuron of a particular motor unit is activated, all of the muscle fibers it innervates are stimulated to contract simultaneously.
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This is known as the "all-or-none" principle of muscle contractions, where all muscle fibers within a motor unit will contract together when stimulated by its associated motor neuron.

When a Motor Neuron of a Particular Motor Unit Is