[The nature of the reactions of organ arterial and venous vessels in the combined action of catecholamines].

In cats, the obviousness of constriction responses of arterial and venous vessels to combined action of adrenergic stimuli depended upon the adrenaline/noradrenaline ratio: a 2,4,6-fold decrease in one of the components reduced the responses as compared with their action when being in equal ratio.