Question

The depolarization of nerve membrane takes place through the influx of .......... ions.

• A. Calcium
• B. Potassium
• C. Sodium
• D. Magneisum

Answer 1

Answer: (C)

Sodium

When the nerve impulse along a neuron transfers from one end to the other end of the neuron, electrical changes across the membrane of the neuron takes place. During polarization in, there is a difference in electrical charge between the outside and inside of the membrane. At the beginning of the action potential, the $N{a}^{+}$ channels open and $N{a}^{+}$ moves into the axon, causing depolarization.