ISSN:
1432-136X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The blood O2 dissociation curve was determined with a microphotometric reaction apparatus in two frog species,Rana catesbeiana andRana brevipoda, and formulated in terms of a modified Hill equation. The O2 dissociation curve was in reasonable agreement with determinations of O2 content, O2 capacity, $$P_{O_2 } $$ and pH (or $$P_{CO_2 } $$ ) in blood samples taken from various blood vessels and heart cavities. The blood O2 affinity inRana catesbeiana (mean body weight 230 g, kept at 25°C) was low:P 50=42 Torr (at 25°C and at ventricular blood pH=7.79). The blood of the smaller frog,Rana brevipoda (mean body weight 16 g), had even lower O2 affinity,P 50 being 52 Torr (at 25°C, pH=7.72). The decrease ofP 50 with increasing body mass, resulting from comparison of these two frog species, is in accordance with literature data on mammals and birds.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00798173
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