Essential Biochemistry - Neurotransmitters (Section 2 - No. 38)

Catecholamines are:

Synthesized from tryptophan.

A class of neurotransmitters.

Excitatory neurotransmitters only.

Inhibitory neurotransmitters only.

Catecholamines (dopamine, norepinephrine, and epinephrine) are a class of neurotransmitters.