AdenosineAdenosine-5'-(N-ethylcarboxamide)Receptor, Adenosine A2AReceptor, Adenosine A1Receptor, Adenosine A2BReceptors, Purinergic P1Purinergic P1 Receptor AgonistsReceptor, Adenosine A3Adenosine DeaminasePurinergic P1 Receptor AntagonistsReceptors, PurinergicAdenosine A2 Receptor AntagonistsXanthinesPhenylisopropyladenosineAdenosine KinaseReceptors, Adenosine A2Adenosine A2 Receptor AgonistsPhenethylamines2-ChloroadenosineAdenosine A1 Receptor AntagonistsTheophyllineAdenosine A1 Receptor AgonistsAdenosine MonophosphateCyclic AMPAdenosine A3 Receptor AntagonistsDipyridamoleAdenosine A3 Receptor AgonistsTriazinesTheobromineInosineVasodilator Agents5'-NucleotidaseTriazolesPurinesPurinergic AntagonistsAdenosine TriphosphatasesTubercidin4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinoneAdenine NucleotidesDose-Response Relationship, DrugNucleoside DeaminasesGuinea PigsCoformycinRadioligand AssayColforsinAdenylate CyclasePentostatinMuscle RelaxationRats, WistarAdenosine PhosphosulfateKineticsCells, CulturedThioinosineVasodilationAdenineDeoxyadenosinesPhosphodiesterase InhibitorsIsoproterenolRats, Inbred StrainsAminophyllineCalciumRats, Sprague-DawleyMuscle, SmoothNucleoside Transport ProteinsHypoxanthineNucleotidasesMyocardiumHypoxanthinesNucleosidesCHO CellsApyraseBinding, CompetitiveRabbitsCricetinaeStimulation, ChemicalEnzyme InhibitorsHeartTritiumCoronary CirculationSignal TransductionBucladesineRibonucleosidesEnzyme ActivationAdenosylhomocysteinaseReceptors, Purinergic P2Coronary VesselsCell MembraneNucleotidesDogsGTP-Binding Proteins8-Bromo Cyclic Adenosine MonophosphateMagnesiumCaffeineExtracellular SpaceHyperemia1-Methyl-3-isobutylxanthineMice, Inbred C57BLMyocardial ContractionRNA, MessengerNorbornanes