<prompt> Action of adranaline is reversed by prazosine but not by propranolTachycardiaBronchial dilatationUrinary symptoms of BHPMigraine  <response>: i.e. Urinary symptoms of BHP: 133-KDT 6th Prazocine is a1 blocker and propranol is non selective beta blocker Urinary symptoms in BHP are solely due to alpha receptorsThe a blockers have no effect on adrenergically induced cardiac stimulation, bronchial dilatation, vasodilation and most of the metabolic changes because these are mediated predominantly through b-receptors 133-KDT 6th 