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Gill Function in an Elasmobranch

By GC Grigg and J Read


Highly efficient oxygen uptake in elasmobranchs, as indicated by frequent excess of PaO2 over PEO2 has previously been ascribed to the operation of multicapillary rather than counter-current gas exchange by the gills. Analysis of models shows that, at maximum efficiency, a multicapillary system cannot account for values of PaO2 greater than (PIO2+PEO2)/2. In Port Jackson sharks Heterodontus portusjacksoni) PaO2 commonly exceeds (PIO2+PEO2)/2, which indicates the operation of a functional counter-current at the respiratory surface. The anatomical basis of this counter-current is provided by the demonstration that a continuous flow of water passes between the secondary lamellae into septal canals and thence via the parabranchial cavities to the exterior

Topics: elasmobranch, gill function, oxygen uptake, interbranchial septa, 270603 Animal Physiology - Systems
Publisher: Springer-Verlag
Year: 1971
OAI identifier: oai:espace.library.uq.edu.au:UQ:9133

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