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. 1980 Jan;298:13–23. doi: 10.1113/jphysiol.1980.sp013063

Changes in partial pressure of carbon dioxide with time in carotid arterial blood in cats.

B Carruthers, J Ponte, M J Purves
PMCID: PMC1279098  PMID: 7359379

Abstract

1. A rapidly responding CO2 sensor and cuvette were placed in the carotid artery of anaesthetized cats and changes of PCO2 in post-pulmonary capillary blood were recorded when flow through the cuvette was suddenly stopped. 2. Under control conditions when the cats breathed spontaneously or were ventilated artificially, stop-flow caused Pa, CO2 to decay by 2--5 mmHg reaching a new equilibrium in 10--15 sec. The amount by which CO2 decayed was reduced by the inhalation of high O2. The decay was enhanced by hypoxia, the inhalation or infusion of CO2. It was reversed by the administration of acetazolamide: now with stop-flow, Pa, CO2 rose by 8--15 mmHg. 3. the mechanism of this decay is uncertain. We propose that it is due to the transfer of CO2 from plasma to red cells in post-capillary blood in response to the reduction of [H+]i as H+ binds to Hb following the oxylabile release of CO2 from Hb.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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