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What is Which of them is TRUE about Na –  - K+ pump and explain in detail?
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.