if the inner surface of the axonal memebrane has less conc of Na... how does it push three na+ outside?? 

Dear student,
Please find below the solution to the asked query

The Naions are pumped inside or outside by the Sodium-Potassium Pump​ which pumps 3Na+out and 2K+ in during resting potential.​ This pump utilises energy (ATPs) to transport ions across the membrane against concenteration gradient.

Hope this information will clear your doubts about the Sodium-Potassium Pump.
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Regards 
 

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