Carbon monoxide (CO), like nitric oxide (NO), is a vasodilatating substance. CO acts also as a putative neural retrograde messenger in the nervous system where it has been implicated in the regulation of large number of physiological and pathological processes, including long-term potentiation and depression, learning and memory, pain processing, vasodilatation and myorelaxation, inhibition of platelet aggregation and hormone releasing.
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