<prompt> Which of them is TRUE about Na - K pumpK is pumped against the gradient2K are exchanged with 5NaHypercalcemia causes arrest in Na K pumpIncrease in intracellular Na increases action potential  <response>: In Na-K exchange, 3 Na goes out and 2K goes into the cell with the utilization of ATP. Hence it is a primary active transport. Due to the net flow of Na outwards, there is a potential difference that occurs. Both Na and K are pumped against a concentration gradient by using ATP. 