2-adrenergic receptor by binding to occur adenyl cyclase stimulation increases secretion of cyclic AMP cause bronchial smooth muscle relaxation would result in bronchial tubes expand.
By binding to 2 adrenergic receptor stimulation adenyl cyclase increasing cyclic AMP causes the secretion of bronchial smooth muscle relaxation, resulting in airway expansion.
By binding to 2 adrenergic receptor stimulate adenyl cyclase increased secretion of cyclic AMP applied to smooth muscle trachea loose as a result of bronchial extension.