Q.

Sodium-potassium pump helps maintain resting membrane potential by

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a

simple diffusion of Na+ and Koutside and inside respectively

b

active transport of equal numbers of Na+ and K

c

transporting negatively charged proteins out of the cell

d

active transport of Na+ and Kagainst concentration gradient

answer is D.

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Detailed Solution

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Ionic gradients across the resting membrane are maintained by the active transport of ions by the sodium-potassium pump which transports 3 Na+ outwards for 2 K+ into the cell. As a result, the outer surface of the axonal membrane possesses a positive charge while its inner surface becomes negatively charged and therefore is polarised.

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