Answer :
A neuron depolarizes when the Na+ channels open, and the ion flows into the cell. If you open an Na+ channel in a typical neuron, Na+ will enter the cell, and the cell will depolarize. Option A.
When does a neuron depolarize?
When the electrical stimulus is applied to the neuron or when a neurotransmitter joins its receptor, ion channels activate.
Ion channel openning produces depolarization by letting sodium get into the cell.
Depolarization, due to the increase of possitive charges, propagates to inactivated regions adjacent to the membrane opening more sodium channels.
Ions traffic will consist of the pass of sodium to the interior of the cell and potassium to the exterior.
- K+ follows a concentration gradient,
- Na+ follows an electrochemical gradient.
The interchange results in an increase of positive charges in the interior of the cell. This depolarization activates an action potential that extends to the rest of the membrane.
So, when openning a Na+ channel in a typical neuron, Na+ will enter the cell, and the cell will depolarize. Option A is correct.
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