Isotonic
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Isotonic Fluid
Fluid that has the same concentration of solutes (osmolality) as body fluids.
- For Isotonic muscle exercise, see Isometric exercise and Weight training.
- For the term associated with muscle contraction, see isotonic (exercise physiology)
- For the term in nuclear physics, see isotone
Isotonic literally translates to equal tension. The term is used in several different contexts.
Isotonic solution bears the same chemical resemblance of the body’s blood, plasma and tears. All fluids in the body have a certain concentration, referred to as osmotic pressure. The body’s common osmotic pressure, which is isotonic, allows a consistent maintenance of body tissues. In order for a substance to be absorbed and used in the body’s metabolism, it must be transported in an isotonic state.
Cell biology
Cells have a semipermeable membrane that allows the diffusion (flow) of water, but not the dissolved compounds such as salt ions (solutes). Water diffuses across the membrane in direction of the higher concentrated solution in a process called osmosis, thereby generating osmotic pressure if the inside concentration is higher. Plant cells often rely on this osmotic pressure for structural support. Under isotonic conditions the concentrations of impermeable solutes, the osmolality, is the same inside and outside the cell and there is no osmotic pressure. A medium of lower osmolality is called hypotonic and one of higher osmolality is called hypertonic.
Medicine
An isotonic solution that mimicks the osmolality of blood for humans and many other mammals consists of 0.9% (9 g/L) sodium chloride in water and is often referred to as saline. Saline is generally administered via an intravenous drip. Red blood cells will not change their form in such an isotonic medium while they would swell and even burst in pure water.
Athletics
This term is also used in relation to a sports drink with added salts mimicking the osmolality of blood. This property is claimed by their advertising campaign to increase physical endurance. The statistically insignificant (6 rowers) scientific study often quoted, however, attributes the 10% increase in endurance over water to the higher carbohydrate content.[1]
See also
nl:Isotoon nds:Isoton (Karnphysik)sv:Isotonvi:Đẳng trương
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Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
