ApaminScorpion VenomsBee VenomsCharybdotoxinSmall-Conductance Calcium-Activated Potassium ChannelsPotassium Channel BlockersBiological FactorsPotassium Channels, Calcium-ActivatedHormone AntagonistsDose-Response Relationship, DrugPotassium ChannelsDopamine AntagonistsExcitatory Amino Acid AntagonistsNeurokinin-1 Receptor AntagonistsNarcotic AntagonistsMuscarinic AntagonistsHistamine H2 AntagonistsRats, Sprague-DawleyInterleukin 1 Receptor Antagonist ProteinGuinea PigsPiperidinesRats, WistarGABA AntagonistsPurinergic P2 Receptor AntagonistsMuscle RelaxationHistamine H1 AntagonistsTetraethylammoniumPurinergic P1 Receptor AntagonistsCalciumHistamine AntagonistsMembrane PotentialsNicotinic AntagonistsMuscle, SmoothAdenosine A2 Receptor AntagonistsAdrenergic alpha-1 Receptor AntagonistsNitroarginineVasodilationElectric StimulationAcetylcholineSerotonin 5-HT3 Receptor AntagonistsPotassiumMesenteric ArteriesSerotonin 5-HT2 Receptor AntagonistsMuscle ContractionCalcium Channel Blockers4-AminopyridineAdenosine A1 Receptor AntagonistsPyrazolesLeukotriene AntagonistsAngiotensin Receptor AntagonistsQuinoxalinesIntermediate-Conductance Calcium-Activated Potassium ChannelsPatch-Clamp Techniques