nonneurotransmitter

A nonneurotransmitter is a chemical compound that is not classified as a neurotransmitter. Neurotransmitters are chemical messengers that transmit signals across synapses, the junctions between neurons, to enable communication between neurons and other cells. Nonneurotransmitters, on the other hand, do not play a direct role in this process. They can still influence neural activity indirectly or have other biological functions unrelated to neurotransmission. Examples of nonneurotransmitters include certain hormones, vitamins, and other signaling molecules. The distinction between neurotransmitters and nonneurotransmitters is not always clear-cut, as some compounds may have both neurotransmitter and nonneurotransmitter functions depending on the context. The classification of a compound as a neurotransmitter or nonneurotransmitter can also vary across different scientific sources and may be subject to revision as new research emerges.