<prompt> An increase in external K concentration:Decrease RMPIncrease RMP by 10 mv for each 10 mEqL increase in KNo changeIncrease RMP by 20 mv for each 10 meqL increase in K  <response>: With hyperkalemia, membrane voltage is depolarized gradually. Depolarization of membrane voltage means decrease in RMP. Remember, a decrease in the membrane potential RMP means that the voltage has moved closer to ground 0 mv or become more positive. 