Fig. 14. Transmembrane currents in the Hodgkin-Huxley model. (a) Three examples of the sigmoid relationship between transmembrane potential V and steady state conductances m,. Solid and dotdashed lines denote "activation" channels (such as m and n) whereas the dashed line denotes an inactivation channel (such as h) (b) Exponential "relaxation" of transmembrane conductance according to (33), following a discrete change in the transmembrane potential (lower line). Conductance m 'relaxes' from m,(V1) to m, (V2)
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