Vasoactive Intestinal PeptideReceptors, Vasoactive Intestinal PeptideReceptors, Vasoactive Intestinal Peptide, Type IIReceptors, Vasoactive Intestinal Polypeptide, Type IPituitary Adenylate Cyclase-Activating PolypeptideGastrointestinal HormonesPeptide PHINeuropeptidesReceptors, Gastrointestinal HormoneReceptors, Pituitary Adenylate Cyclase-Activating PolypeptideVasoconstrictor AgentsSubstance PReceptors, Pituitary HormoneSecretinVasodilator AgentsCalcitonin Gene-Related PeptideEndothelin-1Neuropeptide YReceptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type IVasodilationVasoconstrictionSomatostatinCyclic AMPUrotensinsMuscle RelaxationEndothelinsNitric OxideBradykininVasomotor SystemGastric FundusEndothelin-2AdrenomedullinAngiotensin IIDose-Response Relationship, DrugRegional Blood FlowNeurotransmitter AgentsSuprachiasmatic NucleusSubmucous PlexusEndothelium, VascularAcetylcholineNitroprussideBlood PressureNeurotensinRats, Sprague-DawleyAtropineNorepinephrineMuscle, SmoothCells, CulturedSerotoninHistamineNitric Oxide SynthaseColforsinMuscle, Smooth, VascularVipomaGuinea PigsRats, WistarParasympathetic Nervous SystemPeptidesGanglioneuromaDogsElectric StimulationMuscle ContractionCholecystokininEnteric Nervous SystemPenisRats, Inbred StrainsGalaninVascular ResistanceIndomethacinHemodynamicsAdenylate CyclaseIsoproterenolMicrocirculationNG-Nitroarginine Methyl EsterPhenylephrineMyenteric PlexusSincalideCholine O-AcetyltransferaseRadioimmunoassaySwineReceptors, EndothelinRNA, MessengerEpoprostenolImmunohistochemistryNeuronsTime FactorsNerve FibersSubmandibular GlandMotilinPancreatic HormonesPancreatic PolypeptideBombesinPapaverineArteries6-Ketoprostaglandin F1 alphaVasopressinsArteriolesApudomaReceptors, Calcitonin Gene-Related PeptidePerfusion