these paradoxical effects were brought about by that portion of the high dose of histamine which re-entered the cat 's systemic circulation.4 the order of potency of the vasodilators was the same for their potentiating effect on the acetylcholine-induced contractile responses as for their enhancing effect on muscle blood flow : bradykinin > histamine > > papaverine > > nah ( 2 ) po ( 4 ) > kcl .
C0026820
contractile
C0006100
bradykinin