Adenosine-5'-(N-ethylcarboxamide)AdenosineReceptors, Purinergic P1Purinergic P1 Receptor AgonistsReceptor, Adenosine A2BReceptors, PurinergicPhenylisopropyladenosinePurinergic P1 Receptor AntagonistsXanthinesPhenethylamines2-ChloroadenosineReceptor, Adenosine A2ATheophyllineAdenosine A2 Receptor AntagonistsReceptor, Adenosine A3Receptor, Adenosine A1TriazinesCyclic AMPVasodilator AgentsDipyridamole4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinoneTriazolesTheobrominePurinergic AntagonistsMuscle RelaxationRadioligand AssayPurinesGuinea PigsColforsinDose-Response Relationship, DrugAdenylate CyclaseMuscle, SmoothRats, WistarCHO CellsVasodilationRats, Inbred StrainsCells, CulturedCricetinaePhosphodiesterase InhibitorsBinding, CompetitiveIsoproterenolMuscle ContractionMast CellsAcetylcholineStimulation, ChemicalAdenosine TriphosphateGTP-Binding ProteinsTritiumIndomethacinDuodenumN-Formylmethionine Leucyl-PhenylalanineAorta, ThoracicHeartMyocardial ContractionElectric StimulationReceptors, Cell SurfaceSerotoninCoronary VesselsEnzyme Inhibitors