What type of neurotransmitter includes amino acids?

The correct response highlights the categorization of neurotransmitters based on their chemical composition. Excitatory and inhibitory neurotransmitters indeed include amino acids, which serve crucial roles in the functioning of the nervous system.

Amino acids are the building blocks of proteins, and several key neurotransmitters are derived from them. For example, glutamate is an excitatory neurotransmitter, while gamma-aminobutyric acid (GABA) is an inhibitory neurotransmitter. Understanding their functions and how they act on neurons is essential for recognizing how neurochemical signaling regulates mood, behavior, and many physiological processes in the body.

The other options do not specifically indicate that they are comprised of amino acids. Biogenic amines primarily refer to neurotransmitters like dopamine and serotonin, which are derived from amino acids but do not include amino acids themselves as a category. Peptides and neuropeptides relate to larger chains of amino acids and are involved in signaling but are not classified simply under the broader category of amino acid neurotransmitters, which is central to the identification of the correct choice.