The sodium-potassium pump establishes concentration gradients:
(a) of higher sodium concentrations inside the cell and higher potassium concentrations outside the cell
(b) of sodium and potassium but the area of their concentrations (inside or outside) depends on the needs of the cell
(c) of higher potassium concentrations inside the cell and higher sodium concentrations outside the cell
(d) by pumping sodium outside the cell and potassium is cotransported out as well

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