Blood acid-base balance as a function of water oxygenation: a study at two different ambient CO2 levels in the dogfish, Scyliorhinus canicula

Respiration Physiology
J P TruchotP Dejours

Abstract

In the unanesthetized dogfish, Scyliorhinus canicula, oxygen and carbon dioxide partial pressures and concentrations in inspired and expired water and the acid-base balance of arterial blood, pHa and PcCO2, were determined. Each dogfish was exposed to waters differing in oxygenation and in CO2 levels, which was controlled with a pH-CO2-stat device, for successive 2- to 3-h periods. The four ambient conditions were: normoxia-normocapnia (inspired PO2, PIO2 ca 160 Torr; PICO2 ca 0.3 Torr), hyperoxia-normocapnia (PIO2 ca 730 Torr), hyperoxia-hypercapnia (PICO2 ca 1.0 Torr); normoxia-hypercapnia. At both low and high ambient CO2, the inspired-expired O2 and CO2 concentration differences increased in hyperoxia. Ventilation was depressed, and concomitantly, PACO2 increased and the arterial plasma pH decreased. The hypercapnic acidosis was rapidly but only partially compensated by an increase of the plasma bicarbonate concentration. Due to the buffer action of carbonate in sea water, low and high ambient CO2 levels corresponded respectively to high and low values of the CO2 capacitance coefficient, betaWCO2. At both ambient oxygenation levels, the expired-inspired PCO2 difference was greater at low than at high betaWCO2. At a given am...Continue Reading

References

May 1, 1982·Respiration Physiology·A ToulmondJ P Truchot
Jan 1, 1984·Comparative Biochemistry and Physiology. A, Comparative Physiology·D J Barrett, E W Taylor
May 5, 2000·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·M L Burleson, N J Smatresk
Mar 20, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·J P Truchot, J Forgue
Jun 10, 2009·Respiratory Physiology & Neurobiology·Richard Kinkead

Citations

Jun 1, 1977·Respiration Physiology·P Dejours, H Beekenkamp
Sep 1, 1975·Comparative Biochemistry and Physiology. A, Comparative Physiology·S A Shapiro, D L Hoffman
Jun 1, 1968·Respiration Physiology·P DejoursG Verriest
Jan 1, 1966·Respiration Physiology·H Rahn
May 1, 1967·Respiration Physiology·C Albers, K Pleschka

Related Concepts

Evaluation of Acid-base Balance
Dioxygen
Alveolar Ventilation Function
Scyliorhinus canicula
Depressed - Symptom
Cell Respiration
Seawater preparation
Shark - fish
Hyperoxia
Plasma pH NOS

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