The catecholaminergic system includes which neurotransmitters?

The catecholaminergic system includes which neurotransmitters?

• A. Dopamine, Norepinephrine, and Epinephrine
• B. Acetylcholine only
• C. Serotonin only
• D. Glutamate and GABA

Answer: (A)

Catecholaminergic neurotransmitters are the catecholamines—dopamine, norepinephrine, and epinephrine. They share a catechol group in their chemical structure and are derived from the amino acid tyrosine through specific enzymatic steps. These molecules function as key modulators in both the brain and autonomic nervous system, influencing movement, arousal, attention, mood, and sympathetic responses. The other listed neurotransmitters belong to different families: acetylcholine is part of cholinergic signaling, serotonin is an indoleamine derived from tryptophan, and glutamate and GABA are amino acid transmitters not containing the catechol structure. Therefore, dopamine, norepinephrine, and epinephrine are the neurotransmitters that define the catecholaminergic system.

Catecholaminergic neurotransmitters are the catecholamines—dopamine, norepinephrine, and epinephrine. They share a catechol group in their chemical structure and are derived from the amino acid tyrosine through specific enzymatic steps. These molecules function as key modulators in both the brain and autonomic nervous system, influencing movement, arousal, attention, mood, and sympathetic responses. The other listed neurotransmitters belong to different families: acetylcholine is part of cholinergic signaling, serotonin is an indoleamine derived from tryptophan, and glutamate and GABA are amino acid transmitters not containing the catechol structure. Therefore, dopamine, norepinephrine, and epinephrine are the neurotransmitters that define the catecholaminergic system.