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Question 21.1: The concentration of Na^+ inside a squid axon is 0.050 M (50...

The concentration of Na^{+} inside a squid axon is 0.050 M (50 mM), in comparison with [Na^{+}] = 0.440  M (440  mM) in the fluid surrounding the cell.

a. Calculate the equilibrium potential E_{ion} for the Na^{+} ion at 310 K.
b. If the membrane potential E_{membrane} = –0.050  V, is the transport of Na^{+} from inside to outside the cell membrane spontaneous?

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