Question

Depolarization of a stimulated nerve is maintained by

• A. $C{a}^{++}$
• B. $C{l}^{-}$
• C. $M{g}^{++}$
• D. $K^{+}$

Answer 1

The correct option is D $K^{+}$

The resting neuron has a membrane potential of -70 mV, which is maintained by the potassium leak channels. The action potential is initiated by depolarization, a reduction in the difference in charge across the membrane. The membrane permeability reverses where the sodium ions enter inside the axon while potassium moves out and maintains the depolarization.

Therefore, the correct answer is option D.