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All-or-none Response: Phenomenon in which a muscle fiber contracts completely when exposed to a threshold stimulus, or not at all. When a skeletal muscle is stimulated to contract by a motor neuron a minimum amount of stimulus is needed to start the process of muscle contraction.
Ia sensory fiber response. Stretch alone: small dynamic response to muscle. stretch, a moderate increase in steady-state firing. Static gamma motor neuron stimulated: steady-state. response increase, dynamic response decrease. Dynamic gamma motor neuron stimulated: dynamic. response markedly enhanced, steady-state response. gradually returns to original level. Increase in activity of dynamic gamma motor neurons. increase the dynamic sensitivity of the type Ia endings. but have no influence on the type II endings.