depression in the amplitude of e.j.ps produced by noradrenaline or isoprenaline reduced the amplitude of phasic contractions evoked by e.j.ps.6 these inhibitory actions of the catecholamines on mechanical responses and on e.j.ps were suppressed by pretreatment with propranolol ( 4 x 10 ( -6 ) m ) .7 dog tracheal smooth muscles are innervated by cholinergic excitatory and adrenergic inhibitory systems .
C0022245
isoprenaline
C0007412
catecholamines