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Definition of Isotonic solution

Isotonic solution: A solution that has the same salt concentration as the normal cells of the body and the blood. As opposed to a hypertonic solution or a hypotonic solution. An isotonic beverage may be drunk to replace the fluid and minerals which the body uses during physical activity.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=4058
Last Editorial Review: 5/7/2002

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