- A state of normal tension of the tissues by virtue of which the parts are kept in shape, alert, and ready to function in response to a suitable stimulus. In the case of muscle, it refers to a state of continuous activity or tension beyond that related to the physical properties; it is active resistance to stretch; in skeletal muscle it is dependent upon the efferent innervation.
- The osmotic pressure or tension of a solution, usually relative to that of blood.
[G. tonos, tone]
See Also: isotonicity
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Examples: glitazone, GI cocktail, etc.