Stimulus (physiology)
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For other uses, see Stimulus (disambiguation).
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In physiology, a stimulus (pl. stimuli) is a detectable change in the internal or external environment. The ability of an organism or organ to respond to external stimuli is called sensitivity.
When a stimulus is applied to a sensory receptor, it elicits or influences a reflex via stimulus transduction. A stimulus is often the first component of a homeostatic control system.
In order for a stimulus to be detected with high probability, its level must exceed the absolute threshold.
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