Stimulus (physiology)

In physiology, a stimulus is a detectable change in the internal or external environment.

When a stimulus is applied to a sensory receptor, it elicits or influences a reflexvia stimulus transduction.

A stimulus is often the first component of a homeostatic control system.

When a sensory nerve and a motor nerve communicate with each other, it is called a nerve stimulus.

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It uses material from the http://en.wikipedia.org/wiki/Stimulus+%28physiology%29 Wikipedia article Stimulus (physiology).