Question

$N{a}^{+}-K^{+}$pump is found in the membranes of many cells, like nerve cells. It works against electrochemical gradient and involve an integral protein $ATP$ase. For each molecule of $ATP$ used

• A. $3$ ions of $N{a}^{+}$ are pumped out and $2K^{+}$ are taken in
• B. $3$ ions of $N{e}^{+}$ are taken in and $2K^{+}$ are pumped out
• C. $2$ ions of $N{a}^{+}$ are thrown out and $3K^{+}$ are absorbed.
• D. $3$ ions of $K^{+}$ are absorbed and $3N{a}^{+}$ are pumped out

Answer 1

The correct option is A $3$ ions of $N{a}^{+}$ 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, $3N{a}^{+}$ pumped outside and two $K^{+}$ taken in. This process of expelling out $N{a}^{+}$ ions and drawing in $K^{+}$ ions against the concentration gradient and electrochemical gradient s called sodium-potassium exchange pump of the cell.