{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T03:39:20Z","timestamp":1790134760287,"version":"4.0.1"},"reference-count":34,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2008,1,23]],"date-time":"2008-01-23T00:00:00Z","timestamp":1201046400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Exp. Zool."],"published-print":{"date-parts":[[2008,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Hypoxia contracts mammalian respiratory vessels and increases vascular resistance in respiratory tissues of many vertebrates. In systemic vessels these responses vary, hypoxia relaxes mammalian vessels and contracts systemic arteries from cyclostomes. It has been proposed that hypoxic vasoconstriction in cyclostome systemic arteries is the antecedent to mammalian hypoxic pulmonary vasoconstriction, however, phylogenetic characterization of hypoxic responses is lacking. In this study, we characterized the hypoxic response of isolated systemic and respiratory vessels from a variety of vertebrates using standard myography. Pre\u2010gill\/respiratory (ventral aorta, afferent branchial artery, pulmonary artery) and post\u2010gill\/systemic (dorsal and thoracic aortas, efferent branchial artery) from lamprey (<jats:italic>Petromyzon marinus<\/jats:italic>), sandbar shark (<jats:italic>Carcharhinus plumbeus<\/jats:italic>), yellowfin tuna (<jats:italic>Thunnus albacares<\/jats:italic>), American bullfrog (<jats:italic>Rana catesbeiana<\/jats:italic>), American alligator (<jats:italic>Alligator mississippiensis<\/jats:italic>), Pekin duck (<jats:italic>Anas platyrhynchos domesticus<\/jats:italic>), chicken (<jats:italic>Gallus domesticus<\/jats:italic>) and rat (<jats:italic>Rattus norvegicus<\/jats:italic>) were exposed to hypoxia at rest or during pre\u2010stimulation (elevated extracellular potassium, epinephrine or norepinephrine). Hypoxia produced a relaxation or transient contraction followed by relaxation in all pre\u2010gill vessels, except for contraction in lamprey, and vasoconstriction or tri\u2010phasic constriction\u2010dilation\u2010constriction in all pulmonary vessels. Hypoxia contracted systemic vessels from all animals except shark and rat and in pre\u2010contracted rat aortas it produced a transient contraction followed by relaxation. These results show that while the classic \u201csystemic hypoxic vasodilation and pulmonary hypoxic vasoconstriction\u201d may occur in the microcirculation, the hypoxic response of the vertebrate macrocirculation is quite variable. These findings also suggest that hypoxic vasoconstriction is a phylogenetically ancient response.<jats:italic>J. Exp. 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