Interaction of O2 diffusion and O2 metabolism in cat urinary bladder tissue

We measured oxygen exchange across the inside surface of excised urinary bladders that were inflated with gas mixtures. By using a range of Po2 differences between the two sides of the tissue and relatively simple mathematical models, we could infer the exchanges across the outside surface and the total O2 economy of the tissue so that we could evaluate the interaction between diffusion and metabolic O2 consumption. The estimate of the Krogh diffusion constant or permeation coefficient with this preparation avoids errors due to O2 consumption and unstirred layers. At 37 degrees C, the value of bladder tissue O2 consumption was 4.4 times 10(-3) min-1 and the value of the Krogh constant for O2 was 2.22 times 10(-5)cm2min-1atm-1.

Krogh constants for diffusion of nitrogen and carbon monoxide in bladder tissue

We have measured diffusion of N2 and CO through the walls of urinary bladders of cats. The excised bladders were inflated with various gas mixtures and suspended in air. Values of the Krogh diffusion constants at 37 degrees C are 1.14 X 10(-5) for N2, and 1.79 X 10(-5) for CO (units are cm2-min-1-atm-1 and standard errors are less than 10% of the values).