Bronchodilator AgentsAdrenergic beta-3 Receptor AgonistsAdrenergic alpha-2 Receptor AgonistsAdrenergic AgonistsAdrenergic beta-2 Receptor AgonistsAdrenergic beta-AgonistsAdrenergic alpha-AgonistsReceptors, Adrenergic, beta-2AlbuterolClenbuterolReceptors, Adrenergic, beta-3Adrenergic beta-2 Receptor AntagonistsReceptors, Adrenergic, alpha-2ClonidineReceptors, Adrenergic, alpha-1Receptors, Adrenergic, alphaReceptors, AdrenergicFenoterolProcaterolAdrenergic alpha-1 Receptor AgonistsReceptors, Adrenergic, betaGuanabenzPrazosinYohimbineAdrenergic alpha-AntagonistsDexmedetomidineDioxolesReceptors, Adrenergic, beta-1Dose-Response Relationship, DrugAdrenergic alpha-2 Receptor AntagonistsTerbutalineIpratropiumPropanolaminesAsthmaPhenylephrineForced Expiratory VolumeEpinephrineNorepinephrineAdministration, InhalationQuinoxalinesNebulizers and VaporizersRats, Sprague-DawleyAdrenergic beta-AntagonistsPurinergic P1 Receptor AgonistsScopolamine DerivativesSpirometryIsoproterenolCyclic AMPSerotonin Receptor AgonistsDopamine AgonistsMetaproterenolAirway ResistanceRats, WistarVital CapacityBronchoconstrictionSerotonin 5-HT1 Receptor AgonistsPeak Expiratory Flow RateSerotonin 5-HT2 Receptor AgonistsEthanolaminesAdrenergic alpha-1 Receptor AntagonistsAtropine DerivativesLung Diseases, ObstructiveRespiratory Function TestsAdenosine A1 Receptor AgonistsPulmonary Disease, Chronic ObstructiveCells, CulturedAdrenergic AntagonistsSignal TransductionAerosolsMetered Dose InhalersAdrenergic beta-1 Receptor AgonistsAirway ObstructionBronchial Provocation TestsRadioligand AssayMethacholine ChlorideInhalation SpacersDouble-Blind MethodIodocyanopindololGABA AgonistsAdenosine A2 Receptor AgonistsDihydroalprenololGABA-A Receptor AgonistsBronchiGABA-B Receptor AgonistsCannabinoid Receptor AgonistsSerotonin 5-HT4 Receptor AgonistsClemastinePindololTheophyllineAdrenergic beta-1 Receptor AntagonistsDioxanesAdenylate CyclasePurinergic P2 Receptor AgonistsCholinergic AntagonistsIdazoxanAntitussive AgentsArrestinsRespiratory TherapyChlorofluorocarbonsIndans