The equilibrium potential (E) for

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2022-08-10

The equilibrium potential (E) for.

An ion species is the membrane potential observed when its concentrations on each side of the membrane are in equilibrium.
Na+ is about -50 mV in squid axon.
An ion species depends on the ratio of the concentrations of the ion outside (Io) and inside (Ii ) the cell.
An ion species is the potential the membrane potential would approach if it became freely permeable to that ion.
An ion species would be zero if the concentrations of the ion on each side of the membrane were equal.

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safaTerkawi

2022-08-10

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A. False It is the membrane potential that would be required to balance the concentration gradient for that ion.

B. False A positive membrane potential of about +65 mV is required to balance the Na+ concentration gradient.

C. True It can be calculated using the Nernst equation: E=61.5 log10 [Io] [Ii ].valence-1 at 37°C.

D. True Membrane potential approaches 65 mV when freely permeable to Na+.

E. True From the Nernst equation (log10 1=O).

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