The effect that the opening of voltage-gated potassium channels on the membrane potential is it becomes less positive and more negative. These channels allow the entry of potassium (K+) ions into the cell.
At the resting potential, the cell is more negatively charged than the outside the cell.
This negative charge is caused by the accumulation of more sodium (Na+) ions outside the cell than potassium (K+) inside the cell.
When potassium (K+) channels open, the cell becomes more negative because more positive ions leave the cell (hyperpolarized).
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