[Adrenaline and noradrenaline elimination from the blood of rats of different ages].

Elimination of adrenaline and noradrenaline from blood of adult and old rats was studied within different periods after administration of the catecholamines. Adrenaline was eliminated from blood of rats of both age groups with the similar rate; however, the time of elimination of noradrenaline was distinctly longer in old animals are compared with the adult ones. The alterations observed may be due to the effects of sympathetic system on metabolic process in various tissues in the old age.