A muscle cell has an intracellular [Na+] of 14 mM and an extracellular [Na+ ] of 140 mM. Assuming that 2.3 RT/F = 60 mV, what would the membrane potential be if the muscle cell membrane were permeable only to Na+? (A) 80 mV (B) –60 mV (C) 0 mV (D) +60 mV (E) +80 mV

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