In order for a neuron to generate an action potential, which of the following must be true? a. The neuron must be in the refractory period. b. Glial cells must release neurotransmitters into the axon. c. Excitatory impulses must outnumber inhibitory impulses. d. Dopamine and serotonin must be present in equal amounts. e Inhibitory impulses must outnumber excitatory impulses.
