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in the nodal cells(slow response fibers), the normal voltage gated sodium channels dont play a role in the action potential like they do in other cells of the body, and my book says its due to the lower resting membrane potential of nodal cells which is at -70mv, and bc of this the voltage gated sodium channels are in inactivated states bc these cells are partially depolarized being at a lower resting potential. how does a lower resting potential cause the normal sodium channels to become inactivated, and thus not play a role in depolariztion(fast upstroke of phase 0 for example in ventricular muscle action potential)?