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Titolo:
Morphometric partitioning of respiratory surfaces in amphioxus (Branchiostoma lanceolatum pallas)
Autore:
Schmitz, A; Gemmel, M; Perry, SF;
Indirizzi:
Univ Bonn, Inst Zool, D-53115 Bonn, Germany Univ Bonn Bonn Germany D-53115 iv Bonn, Inst Zool, D-53115 Bonn, Germany
Titolo Testata:
JOURNAL OF EXPERIMENTAL BIOLOGY
fascicolo: 22, volume: 203, anno: 2000,
pagine: 3381 - 3390
SICI:
0022-0949(200011)203:22<3381:MPORSI>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
VERTICAL SECTIONS; SYSTEM; LUNGS; CEPHALOCHORDATA; CALIFORNIENSE; EVOLUTION; AREA;
Keywords:
amphioxus; Branchiostoma lanceolatum; anatomical diffusing factor; diffusing capacity; oxygen uptake; respiratory organ; lancelet;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
42
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:
A. Schmitz et al., "Morphometric partitioning of respiratory surfaces in amphioxus (Branchiostoma lanceolatum pallas)", J EXP BIOL, 203(22), 2000, pp. 3381-3390

Abstract

The anatomical diffusing factors (ADFs), defined as the ratio of surface area to the thickness of the diffusion barrier, of possible respiratory surfaces of adult amphioxus (Branchiostoma lanceolatum) were evaluated using stereological methods. The ADF is greatest for the lining of the atrium and for the skin covering the segmental muscles. Calculation of the diffusing capacities for O-2 revealed that the lining of the atrium makes up nearly 83 % of the entire diffusing capacity (8.86 x 10(-3) mul min(-l) mg(-1) kPa(-1)) while the skin over the segmental muscles (9 %), the skin over the metapleural fold (4 %) and the gill bars (4 %) are of minor importance, The diffusing capacity of surfaces lying over coelomic cavities makes up 76 % of the whole diffusing capacity, which is consistent with the hypothesis that the coelom may function as a circulatory system for respiratory gases. Muscles have approximately 23 % of the entire diffusing capacity, indicating thatthey may be self-sufficient for O-2 uptake. The diffusing capacity of the blood vessels in the gill bars is only 1 % of the total. Thus, the 'gills' lack significant function as respiratory organs in amphioxus (lancelets).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 15:05:22