the inhibitory effect of dopamine ( 300 mum ) was largely reversed by phentolamine ( 1 mum ) , but not by propranolol ( 1 mum ) , while the inhibitory action of isoprenaline was competitively antagonized only by propranolol ( pa ( 2 ) of 7.6 ) .5 the contraction of the muscularis mucosae to exogenously applied acetylcholine ( ach , 20 nm ) which was comparable in magnitude with that to electrical stimulation was also inhibited by isoprenaline ( 0.1 mum ) , adrenaline ( 1 mum ) and noradrenaline ( 1 mum ) , but not by dopamine ( 300 mum ) .
C0014563
adrenaline
C0028351
noradrenaline