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Question

Na+K+ pumps are found in membranes of many cells, like nerve cells. It works against electrochemical gradient and involves an integral protein ATPase. For each molecule of ATP used
  1. 3 ions of Na+ are pumped out and 2K+ are taken in 
  2. 3 ions of Na+ are taken in and 2K+ are pumped out
  3. 2 ions of Na+ are thrown out and  3K+ are absorbed
  4. 3 ions of K+ are absorbed, 3Na+ are pumped out 


Solution

The correct option is A 3 ions of Na+ are pumped out and 2K+ are taken in 
Energy from ATP cause conformational change in the solute carrier complex.  From the energy of one ATP, three Na+ ions are pumped outside and two K+ ions taken in.  This process of expelling out Na+ ions and drawing in K+ ions against the concentration gradient or electrochemical gradient is called sodium-potassium exchange pump of the cell.

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