Question

Which of the following statements are correct regarding $N{a}^{+}$ - $K^{+}$ pump?

(i) Needs energy (ATP) to work.
(ii) Expels 3 $N{a}^{+}$ for every 2$K^{+}$ ions imported
(iii) Works against a concentration gradient
(iv) Maintains resting potential

• A. (i) and (iv)
• B. (ii) and (iii)
• C. (i) and (iii)
• D. All of these

Answer 1

Answer: (D)

All of these

The sodium-potassium pump is an ATPase present in the cell membrane which transfers 3 $N{a}^{+}$ out of the cell and 2$K^{+}$ into the cell at the expense of an ATP. Both the ions are exchanged against their electrochemical gradient. It works via active transport. It maintains the potassium ion gradient across the membrane, therefore resulting in balancing the resting membrane potential.

Thus the solution is D, all the statements are correct.