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These famous equations model the squid-axon and are an excellent
example of the type of model that one obtains by using the methods of
the previous section. The equations are:

where

and

corrects for the temperature on the kinetics.
The figures below illustrate the kinetic functions and the functions
for etc. Note that in all cases the steady state
voltage dependence is sigmoidal with *n* and *m* monotonically
increasing and *h* decreasing. Also notice that the maximum of the
time constant of the sodium activation is about .5 and that of *h* and
*n* are 8 and 5 respectively. The sodium activation is more than ten
times as fast as the inactivation and the delayed rectifier current.
Also note that at the activation threshold, the *h* is nearly zero.

*G. Bard Ermentrout*

*1/29/1998*