thus alpha-adrenoceptor-mediated contractile responses of rat pulmonary artery preparations , to adrenaline or noradrenaline , can be attenuated by activation of beta-adrenoceptors , mediating relaxation , and the extent of this attenuation changes under the influence of factors , such as ageing or t4-treatment , which modify beta-adrenoceptor-mediated relaxation in this blood vessel type .
C0014563
adrenaline
C0028351
noradrenaline