10 types of neurotransmitter:
Acetylcholine (ACh) – muscle contraction, memory, and learning

Glutamate – main excitatory neurotransmitter in the brain

GABA (gamma-aminobutyric acid) – main inhibitory neurotransmitter in the brain

Glycine – inhibitory neurotransmitter in spinal cord and brainstem

Dopamine – movement control, reward, and motivation

Serotonin (5-HT) – mood regulation, sleep, and appetite

Norepinephrine – alertness, arousal, and stress response

Epinephrine – fight-or-flight hormone and neurotransmitter

Histamine – wakefulness, appetite control, immune response

Endorphins – natural pain relief and feelings of well-being