Hyperpolarization and duration of the cardiac action potential.
D000200:Action Potentials; D000818:Animals; D002417:Cattle; D004553:Electric Conductivity; D004558:Electric Stimulation; D006321:Heart / Q000187:drug effects / Q000502:physiology*; D006329:Heart Conduction System; D066298:In Vitro Techniques; D008564:Membrane Potentials; D011188:Potassium / Q000494:pharmacology; D013997:Time Factors
D011188:Potassium