median effective doses ( ed ( 50 ) s ) determined only for bradykinin , histamine and papaverine were , respectively , 20.5 , 49.8 , and 3,352 pmol as potentiators , and 13.4 , 199.8 and 85,000 pmol as vasodilators.5 in general , the effect of a given vasoactive substance on the contractile response to acetylcholine was dose-dependent and correlated well with its effect on muscle blood flow at the moment the acetylcholine was injected .
C0006100
bradykinin
C0026820
contractile