the na-k ion exchange pump actively transports 3 intracellular sodium ions for 1 extracellular potassium ion. 3 intracellular sodium ions for 2 extracellular potassium ions. 1 intracellular sodium ion for 2 extracellular potassium ions. 2 intracellular sodium ions for 1 extracellular potassium ion. 3 extracellular sodium ions for 2 intracellular potassium ions.