In the resting state, the outer surface of the axon wall is charged positively with K+ ions and the inner wall has an equal and opposite charge of negative organic ions, as shown in Figure P18.41.
Model the axon as a parallel-plate, capacitor and take C = kea/d; A/d and Q = C*V to investigate the charge as follows: Use typical values for a cylindrical axon of cell thickness d = 1.2 x 10-8 m, axon radius r = 12.0 µm, and cell-wall dielectric constant = 2.9.
1.) How much energy does it take to restore the inner wall of the axon to -70 mV from +30 mV?
This solution includes step by step calculations for energy and current.