If you experimentally increase the concentration of K+ inside a cell while maintaining other ion concentrations as they were, what would happen to the cell's membrane potential?
A) The membrane potential would become more negative.
B) The membrane potential would become less negative.
C) The membrane potential would first become more negative then rebound to be positive.
D) The membrane potential would remain the same.

Question

Quizplus · Accepted Answer

Increasing the concentration of K+ inside a cell would make the inside more positive, which would cause the membrane potential to become less negative. This is because K+ is a positively charged ion that would be attracted to the negatively charged inner surface of the plasma membrane. As K+ moves into the cell, it would cause depolarization of the membrane, meaning the membrane potential would become less negative.

If You Experimentally Increase the Concentration of K+ Inside a Cell