An increase in external K+ concentration:

A. Decrease RMP

B. Increase RMP by –10 mv for each 10 mEq/L increase in K+

C. No change

D. Increase RMP by –20 mv for each 10 meq/L increase in K+

Correct Answer: Decrease RMP

Description: 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.

Category: Physiology

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