Abstract
Summary and conclusion
By means of a new method which permits one to evaluate separately the behavior in situ of the choledochus and duodenum of guinea pig, we confirmed our previous assumption concerning the existence in the terminal bile duct of α-receptors whose activation caused a constriction and β-receptors whose activation caused a dilatation. The contracting action of epinephrine was selectively blocked by diben-amine, while the relaxing action of isopren-aline was blocked by pronethalol.
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