Resting potential K equilibrium potential Nat-inward background current Electrogenic Nat-Kt pump Extracellular space [Na+] [C门 [KT Na/K pump dNa* Nongated Nongated Membrane K' channel A Na channel .单∥ ATP [Na] [A] Cytoplasm Cn [K+• Resting potential – K+ equilibrium potential – Na+ -inward background current – Electrogenic Na+ -K+ pump 18