Respiratory properties of the blood of the burrowing red band fish Cepola rubescens L. |
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Authors: | CR Bridges AC Taylor RJA Atkinson |
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Institution: | Max-Planck-Institut für experimentelle Medizin, Abteilung Physiologie, D-34 Göttingen, F.R.G.;Department of Zoology, University of Glasgow, Scotland;Marine Biological Station, Millport, Scotland |
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Abstract: | The respiratory properties of the whole blood of the burrowing red band fish Cepola rubescens L. were investigated. Oxygen dissociation curves constructed at 15°C were found to be close to hyperbolic in shape with a mean value for the cooperativity coefficient at half-saturation (n50) of 1.56. Half-saturation oxygen tension (P50) for pH = 7.56 (mean in vivo pH of venous blood) was 27 Torr. The blood showed a marked Bohr effect () and also a Root effect which at the in vivo pH reduced oxygen carrying capacity by 20%. The PvCO2 was 3.2 Torr and the buffering power of the blood was low, the buffer value of true plasma averaging 5.43 mmol · 1?1 · pH?1. It is suggested that the large Bohr effect coupled with the low buffer value confers on the haemoglobin a flexibility, in terms of oxygen affinity, to withstand changes which occur in environmental oxygen tensions. |
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