since the relaxant effect is inhibited by tetrodotoxin or hexamethonium , it is neurally mediated and involves stimulation of nicotinic receptors with release of an unknown inhibitory transmitter.2 carbachol-induced relaxation is nonadrenergic since : ( a ) it considerably exceeds the maximal effects of isoprenaline or the effect of 10 ( -3 ) m adrenaline or noradrenaline ;
C0014563
adrenaline
C0028351
noradrenaline