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dc.contributor.authorLopes, Jane Mello-
dc.contributor.authorBoijink, Cheila de Lima-
dc.contributor.authorFlorindo, Luiz Henrique-
dc.contributor.authorCosta Leite, Cleo Alcantara-
dc.contributor.authorKalinin, Ana Lucia-
dc.contributor.authorMilsom, William K.-
dc.contributor.authorRantin, Francisco Tadeu-
dc.identifier.citationJournal of Comparative Physiology B-biochemical Systemic and Environmental Physiology. Heidelberg: Springer Heidelberg, v. 180, n. 6, p. 797-811, 2010.-
dc.description.abstractIn one series of experiments, heart frequency (f (H)), blood pressure (P (a)), gill ventilation frequency (f (R) ), ventilation amplitude (V (AMP)) and total gill ventilation (V (TOT)) were measured in intact jeju (Hoplerythrinus unitaeniatus) and jeju with progressive denervation of the branchial branches of cranial nerves IX (glossopharyngeal) and X (vagus) without access to air. When these fish were submitted to graded hypoxia (water PO2 similar to 140, normoxia to 17 mmHg, severe hypoxia), they increased f (R) , V (AMP), V (TOT) and P (a) and decreased f (H). In a second series of experiments, air-breathing frequency (f (RA)), measured in fish with access to the surface, increased with graded hypoxia. In both series, bilateral denervation of all gill arches eliminated the responses to graded hypoxia. Based on the effects of internal (caudal vein, 150 mu g NaCN in 0.2 mL saline) and external (buccal) injections of NaCN (500 mu g NaCN in 1.0 mL water) on f (R) , V (AMP), V (TOT), P (a) and f (H) we conclude that the O-2 receptors involved in eliciting changes in gill ventilation and associated cardiovascular responses are present on all gill arches and monitor the O-2 levels of both inspired water and blood perfusing the gills. We also conclude that air breathing arises solely from stimulation of branchial chemoreceptors and support the hypothesis that internal hypoxaemia is the primary drive to air breathing.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.description.sponsorshipBrazilian National Research Council for Development of Sciences and Technology-
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada (NSERC)-
dc.publisherSpringer Heidelberg-
dc.sourceWeb of Science-
dc.subjectCardiorespiratory controlen
dc.subjectO-2 chemoreceptorsen
dc.subjectAir breathingen
dc.subjectHoplerythrinus unitaeniatusen
dc.titleHypoxic cardiorespiratory reflexes in the facultative air-breathing fish jeju (Hoplerythrinus unitaeniatus): role of branchial O-2 chemoreceptorsen
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniv British Columbia-
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), Dept Physiol Sci, BR-13565905 São Carlos, SP, Brazil-
dc.description.affiliationSão Paulo State Univ, UNESP, Aquaculture Ctr CAUNESP, Dept Bot & Zool, BR-15054000 Sao Jose do Rio Preto, SP, Brazil-
dc.description.affiliationUniv British Columbia, Dept Zool, Vancouver, BC, Canada-
dc.description.affiliationINCT FAPESP CNPq, Natl Inst Sci & Technol Comparat Physiol, São Paulo, Brazil-
dc.description.affiliationUnespSão Paulo State Univ, UNESP, Aquaculture Ctr CAUNESP, Dept Bot & Zool, BR-15054000 Sao Jose do Rio Preto, SP, Brazil-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Comparative Physiology B: Biochemical Systemic and Environmental Physiology-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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