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Titolo:
Which came first, the lung or the breath?
Autore:
Perry, SF; Wilson, RJA; Straus, C; Harris, MB; Remmers, JE;
Indirizzi:
Univ Bonn, Inst Zool, D-53115 Bonn, Germany Univ Bonn Bonn Germany D-53115 iv Bonn, Inst Zool, D-53115 Bonn, Germany Univ Calgary, Resp Res Grp, Calgary, AB T2N 4N1, Canada Univ Calgary Calgary AB Canada T2N 4N1 s Grp, Calgary, AB T2N 4N1, Canada GH Pittie Salpetriere, F-75651 Paris, France GH Pittie Salpetriere ParisFrance F-75651 triere, F-75651 Paris, France
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR AND INTEGRATIVE PHYSIOLOGY
fascicolo: 1, volume: 129, anno: 2001,
pagine: 37 - 47
SICI:
1095-6433(200105)129:1<37:WCFTLO>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
BRAIN-STEM PREPARATION; CRAB BIRGUS-LATRO; TERRESTRIAL EXISTENCE; AMBYSTOMA-TIGRINUM; RESPIRATORY RHYTHM; RANA-CATESBEIANA; VENTILATION; EVOLUTION; GILL; FISH;
Keywords:
lung; gill; respiratory mechanisms; air breathing; fish; swim bladder; evolution; functional morphology;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Perry, SF Univ Bonn, Inst Zool, Poppelsdorfer Schloss, D-53115 Bonn, Germany Univ Bonn Poppelsdorfer Schloss Bonn Germany D-53115 n, Germany
Citazione:
S.F. Perry et al., "Which came first, the lung or the breath?", COMP BIOC A, 129(1), 2001, pp. 37-47

Abstract

Lungs are the characteristic air-filled organs (AO) of the Polypteriformes, lungfish and tetrapods, whereas the swimbladder is ancestral in all otherbony fish. Lungs are paired ventral derivatives of the pharynx posterior to the gills. Their respiratory blood supply is the sixth branchial artery and the venous outflow enters the heart separately from systemic and portal blood at the sinus venosus (Polypteriformes) or the atrium (lungfish). or is delivered to a separate left atrium (tetrapods). The swimbladder, on the other hand, is unpaired, and arises dorsally from the posterior pharynx. Itis employed in breathing in Ginglymodi (gars), Halecomorphi (bowfin) and in basal teleosts. In most cases, its respiratory blood supply is homologousto that of the lung, but the vein drains to the cardinal veins. Separate intercardiac channels for oxygenated and deoxygenated blood are lacking. Thequestion of the homology of lungs and swimbladders and of breathing mechanisms remains open. On the whole, air ventilatory mechanisms in the actinopterygian lineage are similar among different groups. including Polypteriformes, but are distinct from those of lungfish and tetrapods. However, there is extreme variation within this apparent dichotomy. Furthermore, the possible separate origin of air breathing in actinopterygian and 'sarcopterygian'lines is in conflict with the postulated much more ancient origin of vertebrate air-breathing organs. New studies on the isolated brainstem preparation of the gar (Lepisosleus osseus) show a pattern of efferent activity associated with a glottal opening that is remarkably similar to that seen in the in-vitro brainstem preparation of frogs and tadpoles. Given the complete lack of evidence for AO in chondrichthyans, and the isolated position of placoderms for which buoyancy organs of uncertain homology have been demonstrated, it is likely that homologous pharyngeal AO arose in the ancestors of early bony fish, and was pre-dated by behavioral mechanisms for surface (water) breathing. The primitive AO may have been the posterior gill pouches or even the modified gills themselves, served by the sixth branchial artery. Further development of the dorsal part may have led to the respiratory swimbladder, whereas the paired ventral parts evolved into lungs. (C) 2001 Elsevier Science inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 14:03:00