This condition is called equlibrium. In this state the concentration of a particular nutrient is the same inside the cell as outside of the cell, so no NET movement of solute occurs. Although molecules constantly move between the internal cellular environment and the extracellular environment, there is no NET movement from one environment to the other because the concentration gradient is the same.
I hope this helps. If you have any more questions, myself or another Biology tutor will be happy to assist you.
Mar 18th, 2015
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