What is/are effect on the membrane when extracellular concentration of K+ decreased?

While K+ is positively charged and more abundant on the inside, there exists a great amount of negatively charged paicles (the anions), accounting for the negative charge inside the membrane. The cell membraneforms the border of a neuron and acts to control the movement of substances into and out of the cell. Ref guyton and hall textbook of medical physiology 12/e pg 58