A chemical messenger released from a neuron's terminal that crosses the synaptic gap to stimulate or inhibit the next neuron.
From Greek 'neuron' (nerve) + Latin 'transmittere' (to send across). Literally 'nerve-sender-across.'
Neurotransmitters are the brain's text messages — chemical signals that zip across the gap between neurons to deliver instructions: 'fire!' or 'chill out!'
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