The bronchial e ects of a new alpha-beta agonist that does not cross the blood-brain barrier was…

The bronchial e ects of a new alpha-beta agonist that does not cross the blood-brain barrier was studied in laboratory anim als. It was found that the drug caused relaxation of bronchiolar sm ooth m uscle. The activation of w hich of the follow ing pairs of adrenoceptors m ost likely m ediated the e ect of the drug? A. ß2 postsynaptic and a2 presynaptic B. ß1 presynaptic and a1 postsynaptic C. a2 postsynaptic and ß3 postsynaptic D. a1 presynaptic and ß2 presynaptic E. ß1 postsynaptic and a2 presynaptic

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