during an action potential, after the membrane potential reaches 30 mv, which event(s) primarily affect(s) the membrane potential? view available hint(s)for part g during an action potential, after the membrane potential reaches 30 mv, which event(s) primarily affect(s) the membrane potential? voltage-gated potassium channels begin to open and the sodium-potassium exchange pump begins removing the excess na ions from the inside of the cell. voltage-gated sodium channels begin to inactivate (close) and voltage-gated potassium channels begin to open. voltage-gated sodium channels begin to inactivate (close) and the sodium-potassium exchange pump begins removing the excess sodium ions from the inside of the cell. voltage-gated sodium channels begin to inactivate (close).