Morphometric data on the fish gills, avian, and mamalian lungs

The attached doc file includes: 1- Morphometrics of fish gills, including thickness information about the water-blood barrier, respiratory surface area, and diffusion capacity of the water-blood barrier. 2- Comparison of the mean values of the pulmonary morphometric parameters of the lungs of some species of birds. Harmonic mean thickness of the blood-gas (tissue) barrier (τht), volume of the lung per unit body mass (VL.BM-1), pulmonary capillary blood volume per unit body mass (PCBV.BM-1), pulmonary capillary blood volume per unit surface area of the blood-gas (tissue) barrier (PCBV.S(BGB)-1), surface area of the blood-gas barrier (BGB) per unit body mass (S(BGB).BM-1), surface area of the BGB per unit volume of the lung parenchyma (exchange tissue) (S(BGB).V(LP)-1)), morphometric diffusing capacity of the BGB per unit body mass (Dto2.kg-1) and the total pulmonary morphometric diffusing capacity of the lung per unit body mass (DLo2.kg-1).  3- Comparison of the mean values of the pulmonary morphometric parameters of the lungs of some species of mamalians.