The Na-K pump as a current source. Affinity-driven transport has no reversal potential but its metabolic cost does.
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D001693:Biological Transport, Active; D004553:Electric Conductivity; D006868:Hydrolysis; D007473:Ion Channels / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism*; D013816:Thermodynamics
D007473:Ion Channels; D000255:Adenosine Triphosphate; D012964:Sodium; D011188:Potassium