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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.
Definition. reflex are rapid involuntary motor responsesthe name of the reflex tells us where they occur and what job*a somatic reflex is a contraction of the skeletal muscle,* if the motor response involves the response of smooth muscle cardio muscle or glands it is automatic (visceral) reflex. Term.