Other neurons firing and specific transmitters change the efficacy of a neuron.
Neurotransmitters can either be excitatory or inhibitory.
That is, some neurotransmitters make a cell MORE likely to fire or LESS likely to fire. Note that the text uses the term 'cell' instead of membrane when discussing pre- and post parts of the neuron. Although 'cell' is also correct, 'membrane' is more general and more correct given the purpose for this chapter. Nervous System and Behavior Reprise of the blow fly example. The other leg continues to move.