🧠 Three keys to synaptic signalling: 1️⃣ Seven distinct neurotransmitter systems (dopamine, serotonin, GABA, glutamate, acetylcholine, endorphins, adrenaline) operate in parallel. 2️⃣ Each signal occurs in milliseconds: impulse → release → receptor binding → reuptake/breakdown. 3️⃣ Synaptic dysfunction underlies depression, schizophrenia, Parkinson's, Alzheimer's—making synaptic chemistry the target of modern psychiatric medicine.
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