<prompt> All of the following act as gaseous neurotransmitters exceptOxygenCarbon monoxideNitric oxideH2S  <response>: A Oxygen TYPES OF NEUROTRANSMITTERS: There are many different ways to classify neurotransmitters. Dividing them into amino acids, peptides, and monoamines is sufficient for some classification purposes. Major neurotransmitters: Amino acids: glutamate, aspartate, D-serine, Gamma-aminobutyric acid GABA, glycine Monoamines and other biogenic amines: dopamine DA, norepinephrine noradrenaline; NE, NA, epinephrine adrenaline, histamine, serotonin SE, 5-HT Peptides: somatostatin, substance P, opioid peptides Others: acetylcholine ACh, adenosine, anandamide, nitric oxide, etc.. 