Physiology Hyponatremia has no effect on the RMP (resting membrane potential) because A The cell membrane is impermeable to Na+ B ECF Na+ concentration is high C Intracellular K+ concentration is high D Equilibrium potential for Na+ is +60 mV 💡 Explanation Hyponatremia has no effect on the RMP (resting membrane potential) because ✓ Correct Answer: D. Equilibrium potential for Na+ is +60 mV