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An isotonic cellular environment occurs when an equal solute concentration exists inside and outside the cell. When a cell is in an isotonic environment, the cell will not lose or gain any solutes.
An isotonic solution has an equal amount of dissolved solute in it compared to the things around it. Is is a medium between hypotonic and hypertonic solutions.
In an isotonic environment, there will be equal movement of molecules in and out of a cell. Therefore, the cell will neither expand, nor shrink.
Other Meanings
In isotonic muscle exercise, the muscles remain under relatively constant tension, for example, in weightlifting.
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