If [K+]out increases while [K+]in is constant, what happens to EK?
QUESTION
If [Na+]out decreases while [Na+]in is constant, what happens to ENa?
QUESTION
If extracellular K+ rises (hyperkalemia), what is the immediate effect on resting Vm?
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ANSWER
Resting Vm depolarizes (becomes less negative). Elevated extracellular potassium shifts the potassium equilibrium potential less negative, pulling the resting potential toward it via leak channels.