The Stimulus (physiology) reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

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 reflex via stimulus transduction.

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

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