1. A 25-year-old m an com plained to his physician of painful erection and im paired ejaculation…

1. A 25-year-old m an com plained to his physician of painful erection and im paired ejaculation during intercourse. Three weeks earlier, he had been diagnosed w ith Raynaud disease and had started an appropriate therapy. A drug w ith w hich of the follow ing m echanism s of actions m ost likely caused the patient’s sym ptom s? a. ß2-receptor blockade b. M3-receptor activation c. ß1-receptor blockade d. a2-receptor activation e. a1-receptor blockade f. Nm -receptor activation

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