isotonic
1. Relating to isotonicity or isotonia. 2. Having equal tension; denoting solutions possessing the same osmotic pressure; more specifically, limited to solutions in which cells neither swell nor shrink. Thus, a solution that is isosmotic with intracellular fluid will not be i. if it includes solute, such as urea, that freely permeates cell membranes. 3. In physiology, denoting the condition when a contracting muscle shortens against a constant load, as when lifting a weight. Cf.:auxotonic, isometric (2).

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iso·ton·ic .ī-sə-'tän-ik adj
1) of, relating to, or exhibiting equal osmotic pressure <\isotonic solutions> compare HYPERTONIC (2), HYPOTONIC (2)
2) of, relating to, or being muscular contraction in the absence of significant resistance, with marked shortening of muscle fibers, and without great increase in muscle tone compare ISOMETRIC (2)
iso·ton·i·cal·ly -i-k(ə-)lē adv
iso·to·nic·i·ty -tō-'nis-ət-ē n, pl -ties

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adj.
1. describing solutions that have the same osmotic pressure. See osmosis.
2. describing muscles that have equal tonicity.

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iso·ton·ic (i″so-tonґik) [iso- + tonic] 1. denoting a solution in which body cells can be bathed without a net flow of water across the semipermeable cell membrane. 2. denoting a solution having the same tonicity as some other solution with which it is compared, such as physiologic salt solution and the blood serum. 3. maintaining uniform tonus; see under contraction and exercise.

Medical dictionary. 2011.

Look at other dictionaries:

  • Isotonic — I so*ton ic, a. [Iso + tonic.] 1. Having or indicating, equal tones, or tension. [1913 Webster] 2. (Physiology, Biochemistry) Having an osmotic pressure (tonicity) equal to that of a reference solution; of aqueous solutions. Contrasting with… …   The Collaborative International Dictionary of English

  • isotonic — ISOTÓNIC, Ă adj. v. izotonic. Trimis de LauraGellner, 13.09.2007. Sursa: DN …   Dicționar Român

  • isotonic — 1828, from Gk. isotonos of level pitch; equally stretched, from iso (see ISO (Cf. iso )) + tonos (see TENET (Cf. tenet)) …   Etymology dictionary

  • isotonic — [ī΄sō tän′ik, ī΄sətän′ik] adj. [< Gr isotonos (< isos, equal + tonos, a stretching: see TONE) + IC] 1. having equal tension 2. having the same osmotic pressure; esp., designating or of a salt solution having the same osmotic pressure as… …   English World dictionary

  • Isotonic — The term isotonic may refer to; * Isotonic muscle exercise and Weight training * Isotonic (exercise physiology) for the term associated with muscle contraction * An isotone in nuclear physics * Isotonic solutions, solutions that have equal… …   Wikipedia

  • isotonic — Of a fluid, having a concentration that will not cause osmotic volume changes of cells immersed in it. Note that an isotonic solution is not necessarily isosmotic. See hypotonic, hypertonic …   Dictionary of molecular biology

  • isotonic — adjective a) having the same osmotic pressure Use an isotonic saline solution in your neti pot to prevent irritation of your nasal passages. b) Having the same concentration of solutes as human blood …   Wiktionary

  • isotonic — i|so|ton|ic [ ,aısə tanık ] adjective 1. ) an isotonic drink or other liquid replaces substances that your body needs but has lost, for example because you have done a lot of physical exercise 2. ) used for describing a type of exercise in which… …   Usage of the words and phrases in modern English

  • isotonic — UK [ˌaɪsəʊˈtɒnɪk] / US [ˌaɪsəˈtɑnɪk] adjective 1) an isotonic drink or other liquid replaces substances that your body needs but has lost, for example because you have done a lot of physical exercise 2) used for describing a type of exercise in… …   English dictionary

  • isotonic —    Having the same salinity as body fluids. You can make a quart of water isotonic by adding a slightly rounded measuring teaspoon of table salt to a quart of water …   Herbal-medical glossary

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