- The reaction of a muscle, nerve, gland, or other excitable tissue to a stimulus.
- Any act or behavior, or its constituents, that a living organism is capable of emitting. Reflexes are usually excluded because they are typically elicited by a specifiable (unconditioned or natural) stimulus rather than emitted under circumstances in which the stimulus was not specifiable.
[L. responsus, an answer]
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Examples: glitazone, GI cocktail, etc.