CO2 back-diffusion in the rete aids O2 secretion in the swimbladder of the eel

Respiration Physiology
H KobayashiP Scheid

Abstract

In order to estimate the relative importance of back-diffusion of O2 and CO2 for their partial pressure enhancement in the swimbladder, we have determined O2 and CO2 partial pressure and content and pH in microsamples collected non-obstructively from the afferent and efferent rete vessels in the European eel. 1. The PO2 increased significantly along the arterial vessels of the rete (from 33 to 303 Torr), with no change in O2 content, suggesting O2 not to be exchanged in the rete counter-current system. 2. A corresponding increase of PCO2 (from 4 to 35 Torr) was accompanied by a significant rise in CO2 content (from 8 to 15 mmol.L-1), suggesting significant CO2 back-diffusion in the rete. 3. Changes in PO2 during passage of blood through the swimbladder epithelium were variable and small, and the PO2 in rete venous blood was similar to that in rete arterial blood, explaining the lack of O2 back-diffusion. 4. Using blood CO2 dissociation data, about 70% of the rise in arterial CO2 content was estimated to derive from diffusion of CO2, the remaining 30% from diffusion of HCO3-, from venous to arterial rete capillaries, or from H+ transport in the opposite direction. The data indicate that CO2 back-diffusion in the rete does not on...Continue Reading

References

Oct 1, 1989·Respiration Physiology·H KobayashiP Scheid
Oct 1, 1969·The Journal of Physiology·R E Forster, J B Steen
Oct 1, 1971·Journal of Applied Physiology·J N Cameron
Sep 1, 1967·Journal of Applied Physiology·V A Tucker
Jan 1, 1983·Reviews of Physiology, Biochemistry and Pharmacology·R Fänge

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Citations

Mar 20, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·C R BridgesW Waser
Nov 24, 2004·Respiratory Physiology & Neurobiology·Bernd Pelster
Apr 7, 2016·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Bernd PelsterAdalberto L Val
May 6, 2016·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Gabriel SchneebauerBernd Pelster
Nov 22, 2019·Journal of Fish Diseases·Stacey Elizabeth Henderson, Shane Matthew Boylan
Dec 31, 1997·The American Journal of Physiology·B Pelster, H Niederstätter
Apr 9, 2021·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Bernd Pelster
Sep 18, 2007·The Journal of Experimental Biology·Pia Koldkjaer, Michael Berenbrink
Oct 26, 2005·The Journal of Experimental Biology·W Waser, N Heisler
Dec 4, 2021·BMC Genomics·Gabriel SchneebauerBernd Pelster

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