Donnan equlibrium and resting potential

[Albertino Bigiani]

Hy neuroscientists!
Here my question: is the normal resting potential of a cell due to a 
Donnan equilibrium or not? Many textbook states this and I wonder if 
this is true because the main ions (K, Na) involved are not at a 
thermodynamic equlibrium as a true Donnal equilibrium requires. So, what 
all about the Donnan equilibrium and why teaching it as an important 
mechanism for understanding the genesis of resting potential?. Am I 
missing some important facts here that explain why Donnan equlibrium is 
put in the chapter of resting potential?
Thank you in advance.
Ciao

Albertino