Ultrastructural changes of the air-blood barrier in the lung of Rana esculenta during natural hibernation

Autor:	Sergio Barni, Paola De Piceis Polver, Franco Bernini
Rok vydání:	1996
Předmět:	Hibernation Lung chemistry.chemical_element Anatomy Biology Oxygen Rana medicine.anatomical_structure chemistry Transmission electron microscopy Cytoplasm Ultrastructure Biophysics medicine Animal Science and Zoology Respiratory system Ecology Evolution Behavior and Systematics
Zdroj:	Amphibia-Reptilia. 17:141-147
ISSN:	1568-5381 0173-5373
DOI:	10.1163/156853896x00171
Popis:	Abstract Possible changes of the air-blood barrier in naturally hibernating frogs were examined by transmission electron microscopy and measured with an eye-piece micrometer under light microscopy. During hibernation a reduction of the "alveolar" air-space and a folding of the air-blood barrier were noticed: the thickness of the latter in the deep lung septa was double that seen in the active phase, as a consequence of deeper changes of the interstitial and surface epithelial components. An increase in electron-dense multilamellar bodies inside the pneumocyte cytoplasm was also observed. These morphological characteristics are indicative of a hypofunctionality in the lung respiratory components and may be related to a decrease in oxygen consumption during this quiescent phase of the annual life cycle.
Databáze:	OpenAIRE
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