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Agonist
A substance that enhances or mimics the action of a neurotransmitter. It binds to the same receptors, amplifying the neurotransmitter’s effects.
Antagonist
A substance that inhibits the action of a neurotransmitter. It blocks or reduces neurotransmitter activity by binding to the receptors, dampening or stopping the signal.
Neurotransmitter
A chemical messenger produced and stored in neurons. It is released into the synaptic gap by the presynaptic neuron and helps transmit signals between neurons by binding to receptors on the postsynaptic neuron.