The role of the vagus nerve in the generation of cardiorespiratory interactions in a neotropical fish, the pacu, Piaractus mesopotamicus

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorCosta Leite, Cleo Alcantara
dc.creatorTaylor, E. W.
dc.creatorGuerra, C. D. R.
dc.creatorFlorindo, L. H.
dc.creatorBelao, T.
dc.creatorRantin, F. T.
dc.date2014-05-20T14:03:49Z
dc.date2016-10-25T17:09:52Z
dc.date2014-05-20T14:03:49Z
dc.date2016-10-25T17:09:52Z
dc.date2009-08-01
dc.date.accessioned2017-04-05T21:30:47Z
dc.date.available2017-04-05T21:30:47Z
dc.identifierJournal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology. New York: Springer, v. 195, n. 8, p. 721-731, 2009.
dc.identifier0340-7594
dc.identifierhttp://hdl.handle.net/11449/22447
dc.identifierhttp://acervodigital.unesp.br/handle/11449/22447
dc.identifier10.1007/s00359-009-0447-2
dc.identifierWOS:000268546700002
dc.identifierhttp://dx.doi.org/10.1007/s00359-009-0447-2
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/867850
dc.descriptionThe role of the vagus nerve in determining heart rate (f (H)) and cardiorespiratory interactions was investigated in a neotropical fish, Piaractus mesopotamicus. During progressive hypoxia f (H) initially increased, establishing a 1:1 ratio with ventilation rate (f (R)). Subsequently there was a hypoxic bradycardia. Injection of atropine abolished a normoxic inhibitory tonus on the heart and the f (H) adjustments during progressive hypoxia, confirming that they are imposed by efferent parasympathetic inputs via the vagus nerve. Efferent activity recorded from the cardiac vagus in lightly anesthetized normoxic fish included occasional bursts of activity related to spontaneous changes in ventilation amplitude, which increased the cardiac interval. Restricting the flow of aerated water irrigating the gills resulted in increased respiratory effort and bursts of respiration-related activity in the cardiac vagus that seemed to cause f (H) to couple with f (R). Cell bodies of cardiac vagal pre-ganglionic neurons were located in two distinct groups within the dorsal vagal motor column having an overlapping distribution with respiratory motor-neurons. A small proportion of cardiac vagal pre-ganglionic neurons (2%) was in scattered positions in the ventrolateral medulla. This division of cardiac vagal pre-ganglionic neurons into distinct motor groups may relate to their functional roles in determining cardiorespiratory interactions.
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageeng
dc.publisherSpringer
dc.relationJournal of Comparative Physiology A: Neuroethology Sensory Neural and Behavioral Physiology
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCardiorespiratory interactions
dc.subjectPiaractus mesopotamicus
dc.subjectVagus nerve
dc.subjectHeart rate
dc.subjectCardiac vagal pre-ganglionic neurons
dc.titleThe role of the vagus nerve in the generation of cardiorespiratory interactions in a neotropical fish, the pacu, Piaractus mesopotamicus
dc.typeOtro


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