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Related Experiment Videos

Transpleural diffusion of carbon dioxide.

J L Plewes, A J Olszowka, L E Farhi

    Respiration Physiology
    |May 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Carbonic anhydrase does not facilitate CO2 movement in lung tissue. Studies on dog lungs showed CO2 diffusion rates align with physical properties, not enzyme activity.

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    Area of Science:

    • Physiology
    • Biochemistry

    Background:

    • Carbonic anhydrase (CA) is present in lung tissue.
    • CA is known to facilitate CO2 transport in other biological systems.

    Purpose of the Study:

    • To investigate the role of lung carbonic anhydrase in CO2 diffusion.
    • To determine if CA activity enhances CO2 movement between blood and alveoli.

    Main Methods:

    • Exsanguinated dog lungs were used to isolate lung tissue effects.
    • Transpleural diffusion rates of CO2, O2, Ar, and N2 were measured.
    • Carbonic anhydrase activity was inhibited using acetazolamide.

    Main Results:

    • The diffusion rates of CO2 and other gases correlated with their molecular weight and solubility.

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  • Inhibition of carbonic anhydrase did not alter CO2 diffusion rates.
  • CO2 movement dynamics were consistent with physical diffusion alone.

    • Conclusions:

    • There is no evidence supporting facilitated diffusion of CO2 across pleural tissue.
    • Lung carbonic anhydrase does not appear to play a significant role in speeding CO2 transport in this model.