with pithed normotensive rats we studied the interaction between beta 2-adrenoceptor-mediated vasodilation and pressor responses elicited by vasopressin , the selective alpha 2-adrenoceptor agonists b-ht 920 and uk 14,304 , and the alpha 2-adrenoceptor-mediated pressor responses of ( -- ) -norepinephrine , tyramine [ via neuronally released ( -- ) -norepinephrine ] , alpha-methylnorepinephrine , and ( -- ) -epinephrine .
C0028351
norepinephrine
C0014563
epinephrine