(2) A condition in which the total number of solutes (i.e. permeable and impermeable) in a solution is the same or equal to the total solutes in another solution.
Word origin: G. isos, equal + osmotic: relating to osmosis.
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... than, say, glucose (MW of 180) which requires some form of facilitative transport to get across a cell membrane. 1.8% urea (ca. 0.3M urea) is isosmotic with plasma (as is 0.9% NaCl, or 5% glucose). A 0.28M solution of urea must be just hypotonic enough for water to flow into and lyse the RBCs. ...
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