When a nerve cell is at rest, potassium is concentrated _____ the nerve cell and sodium is concentrated _____ the nerve cell.

Question

Quizplus · Accepted Answer

When a nerve cell is at rest, there is a higher concentration of potassium ions inside the cell and a higher concentration of sodium ions outside the cell. This creates an electrochemical gradient across the cell membrane, with a negative charge inside the cell and a positive charge outside. This polarized state is essential for the function of nerve cells in transmitting electrical signals. Choice B correctly identifies the concentration of potassium and sodium ions inside and outside the cell, respectively.

When a Nerve Cell Is at Rest, Potassium Is Concentrated