Final answer:
Neurotransmitters are chemical messengers that transmit signals between neurons in the nervous system. They can be categorized into three main groups: amines, amino acids, and peptides. Amines are involved in regulating mood, emotions, and cognition, while amino acids play a crucial role in excitatory and inhibitory neurotransmission. Peptides generally act as neuromodulators and can have both neurotransmitter and hormonal functions.
Step-by-step explanation:
Neurotransmitters are chemical messengers that transmit signals between neurons in the nervous system. They can be categorized into three main groups: amines, amino acids, and peptides. Amines include neurotransmitters like serotonin, dopamine, norepinephrine, and epinephrine. Amino acids include glutamate, GABA, and glycine, while peptides include substances like beta-endorphin and substance P.
Amines are involved in regulating mood, emotions, and cognition, while amino acids play a crucial role in excitatory and inhibitory neurotransmission. Peptides generally act as neuromodulators and can have both neurotransmitter and hormonal functions.