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It actually took me a while to wrap my head around the idea that the electrochemical gradient along axons acts as a battery.  Although it is a simplified view made to help others understand more generally what is going on, I found it more confusing. I think it is perhaps because it is too simplified.  After taking biochem and taking a close look at how the Na+/K+ and its role in our biological system, I’m having a hard time just looking at the bigger picture. But I guess that’s just part of learning how to exercise our brains.