Concentration differences cause ionic imbalances that polarize the cell membrane.

Answer;

-The above statement is true

Explanation;

Concentration differences cause ionic imbalances that polarize the cell membrane, and active transport processes.

The inside of the cell has a low concentration of sodium ions, and the outside of the cell has a higher concentration of sodium ions.The cell membrane separates the inside of a cell (all cells, not just neurons) from the outside, and all chemicals that get into and out of the cell must go thorough it. As in all cells, the cell membrane of a neuron is polarized. This means that there is an electrical difference across the cell membrane.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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