bioelectricity

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Assume that frog muscle cell membrane is permeable to Na and K only. The membrane permeabilities for Na and K are Pna and Pk respectively.
At 16∘C, the resting membrane is -91 mV.

What is the ratio of permeabilities Pna/Pk?

For frog muscle, intracellular and extracellular concentrations of ions are:
IonIntracellularExtracellular
K+1242.2
Na+4109
Cl−1.577
Table entries have units of nM/I.
Answer with 1% accuracy.

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