because the latter are believed to be mediated by intrajunctional alpha-1 adrenoceptors , whereas the others are thought to involve mainly extrajunctional receptors , we explored the possible specificity of r-anp for alpha adrenoceptor subtypes , by comparing r-anp , the calcium channel blocker nifedipine and the vasodilator sodium nitroprusside in their ability to inhibit pressor responses to the alpha-2 and alpha-1 adrenoceptor agonists , clonidine and phenylephrine , in pithed , vagotomized rats .
C0001638
alpha-1 adrenoceptors
C0034784
alpha adrenoceptor