My question arises from study during my Human A+P class, but it goes beyond what I'd be expected to know for the class so I decided to post it here. When potassium exits the cell body during repolarization, is this due to its concentration gradient? If so, why does the chemical gradient get "preference" in deciding the direction of K+ movement, as opposed to the electrical gradient, which I would think would favor depolorization, ie. moving the absolute value of the charge closer to zero. I have a similar confusion about the movement of chloride ions into the cell during hyperpolarization. Thanks for reading.