A state of normal firmness or functional readiness of body tissues or organs; a condition of sustained partial contraction of resting or relaxed muscles.

Tthe osmotic pressure or tension of a solution, as in the cells would swell or shrink depending on the tonicity of the environment.

A property of a solution that depends on the osmotic force exerted across the membrane as influenced by the differing concentrations of solutes in and out of the cell.


Word origin: from the Greek “tonos” = “tone
See also: hypotonicity, hypertonicity, isotonicity.

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A sum of ions in the solution determine the tonicity. In the other term H+ ion concentration in the solution determine the tonicity.

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