Which neurocrine is formed from gases?

Nitric oxide is recognized as a neurocrine formed from gases, distinguishing it from other neurocrines, which are typically synthesized from amino acids or other organic compounds. Unlike classical neurotransmitters that are stored in vesicles and released at synapses, nitric oxide is synthesized on demand and diffuses freely across cell membranes due to its gaseous nature. This allows it to quickly influence nearby cells, particularly in processes such as vasodilation and neuronal signaling.

Moreover, nitric oxide plays a crucial role in various physiological processes, including modulating synaptic plasticity and neurotransmitter release. This gas acts as a signaling molecule in the nervous system and can impact both neuronal communication and blood flow, highlighting its unique role among the listed neurocrines.

The other neurocrines mentioned, such as serotonin, histamine, and glutamate, are synthesized from specific precursor molecules. Serotonin is derived from tryptophan, histamine from histidine, and glutamate from glutamic acid, and they are typically stored in vesicles and released in response to presynaptic neuronal activity. This fundamental difference in synthesis and release mechanisms underscores why nitric oxide is correctly identified as a neurocrine formed from gases.