Na+−K+pump is found in the membranes of many cells, like nerve cells. It works against electrochemical gradient and involve an integral protein ATPase. For each molecule of ATP used
A
3 ions of Na+ are pumped out and 2K+ are taken in
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B
3 ions of Ne+ are taken in and 2K+ are pumped out
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C
2 ions of Na+ are thrown out and 3K+ are absorbed.
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D
3 ions of K+ are absorbed and 3Na+ are pumped out
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Solution
The correct option is A3 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, 3Na+ pumped outside and two K+ taken in. This process of expelling out Na+ ions and drawing in K+ ions against the concentration gradient and electrochemical gradient s called sodium-potassium exchange pump of the cell.