How does a concentration gradient / osmosis work?

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I’m a med student so I know the basics, but how does it really work? Like, if a cell has a high [Na+] and the environment has a low [Na+] how is it possibly entropically favorable for water to press against the cell walls and expand the cell, which would definitely require energy to combat the resting force of the cell Wall’s elasticity. Is this even considered an entropic force?

In: Physics