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* Lipid soluble substances are able to diffuse freely across the lipid bilayer of cells.   
 
* Lipid soluble substances are able to diffuse freely across the lipid bilayer of cells.   
 
* This obviously occurs passively down the concentration gradient.
 
* This obviously occurs passively down the concentration gradient.
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==More Information==
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If more information is need it can be found [http://en.wikipedia.org/wiki/Passive_diffusion here]
 
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