> There are refractory periods, but these are due to 'inactivation' of
>voltage-gated sodium channels (and to some extent, K+ efflux, but that
>supposedly is more significant in the squid axons where this was figured
>out than it is in myelinated human ones), not the neuron running out of
>>>>>>good point. Also associational reciprocal inhibition can block a firing of
a particular neuron.