Nom du corpus

Corpus Systématique Animale

Titre du document

Gas exchange strategy in the Nile crocodile: a morphometric study

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Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • Crocodile
  • Lung
  • Morphometry
  • Strategy
  • Evolution
  • ADF : anatomical diffusion factor
  • % AR : percent of SA included in the effective respiratory zone
  • M B : body mass
  • NVP : non-ventilatory period
  • % P : percent of total lung volume containing parenchyma
  • S A : total surface area of intrapulmonary septa
  • S ANR : that portion ofS A lying out the effective respiratory zone
  • S V : surface-to-volume ratio in the parenchyma
  • ?htR : harmonic mean thickness of the air-blood tissue barrier within the respiratory zone
  • V P : parenchymal volume
  • VP : ventilatory period
Nom du fichier dans la ressource
Reptiles_v2b_00583
Auteur(s)
  • S. F. Perry
Affiliation(s)
  • Fachbereich 7 (Biologie), Universität Oldenburg, D-2900, Oldenburg, Federal Republic of Germany
Résumé

The respiratory surface area (SAR) per kilogram body mass (MB), the harmonic mean thickness of the air-blood barrier (?htR) in the gas exchange tissue, and the anatomical diffusion factor (ADF=SAR/?htR per MB) were calculated for four juvenile Nile crocodiles. The ADF of three small specimens (mean MB=3.59 kg) was 625 cm2·?m?1·kg?1. The values varied considerably among individuals and were similar to that of a 5.68-kg specimen (593 cm2·?m?1·kg?1). Only 9% of the ADF is located in the anterior third of the lung, which because of its conical shape makes up only 14 percent of the total lung volume. Particularly in the middle third of the lung, the proximal region near the intrapulmonary bronchus displays a greater ratio of respiratory/non-respiratory surface areas than do more distally located sampling sites. The ?htR is also significantly smaller proximally than distally. The cumulative ADF per unit MB is greater than that previously reported for this species on the basis of overall estimates of SAR and ?htR, but is still less than that of lizards and testudinids. The disposition of ADF between distal air storage region and the intrapulmonary bronchus is consistent with a bidirectional cross-current gas exchange model.

Catégories Science-Metrix
  • 1 - health sciences
  • 2 - biomedical research
  • 3 - physiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences medicales
  • 4 - ophtalmologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Endocrinology
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Animal Science and Zoology
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Biochemistry
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Physiology
Catégories WoS
  • 1 - science ; 2 - zoology
  • 1 - science ; 2 - physiology
Identifiant ISTEX
F22224CBF880786F63269883F2F79ECB4986E51E
Revue

Journal of Comparative Physiology B

Année de publication
1990
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
9.248
Sous-corpus
  • Reptiles
Type de publication
Journal
ark:/67375/1BB-GB0D2PXD-B
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