assuming that no changes occurred in catecholamine clearance , sk & f 86466 thus appeared to have a prejunctional alpha 2-adrenoreceptor blocking effect , which was countered by a post-junctional alpha-adrenoreceptor blocking effect at the level of the resistance vessels , whereas this latter effect did not alter the pressor responses to cold and postural challenge .
C0001639
alpha
C0034784
alpha-adrenoreceptor