beta-adrenoceptors in ferret tracheal smooth muscle were classified into beta 1 or beta 2 by determination of ( i ) the potency rank order for isoprenaline , noradrenaline and adrenaline , and ( ii ) apparent pa2-values for a specific beta 1-antagonist ( practolol ) and a specific beta 2-antagonist ( ici 118.551 ) and ( iii ) concentration-inhibition curves for procaterol , a beta-agonist showing a biphasic concentration-response curve in organs with a mixed beta 1 and beta 2 adrenoceptor population .
C0028351
noradrenaline
C0014563
adrenaline