Neurotransmitter is a chemical messanger , which release from one neuron and acts on other neuron to carry message . . They are of two types - 1) Excitatory neurotransmitter 2) Inhibitory Neurotransmitter . Excitatory neurotransmitter is acetylcholine , serotonin , adrenalin and nor adrenalin ,where as Inhibitory neurotransmitter is dopamine ,GABA .etc .