Abstract
1. 1. Th O 2Hb dissociation curve for platypus blood shows a typical sigmoid shape with a pronounced Bohr effect. 2. 2. The O 2 capacity for one specimen was 23.5 vol % with a corresponding hematocrit of 50 per cent. 3. 3. The blood displayed a considerable Haldane effect and a large difference in buffer capacity between reduced and oxygenated blood. 4. 4. Arterial. blood samples taken during experimental submersion were analyzed for O 2 and CO 2 pressure and content. CaO 2 falls rapidly during diving and reaches a low of 2 vol % after approximatelyt 3 min, which was close to the endurance limit during experimental conditions. A quick restoration of arterial O 2 saturation characterized the recovery. 5. 5. Platypous showed a distinct bradycardia upon submersion. The rate of decline in heart rate was more pronounced if the arterial blood pressure increased in response to submersion. 6. 6. The findings are discussed in relation to the normal diving habits of the platypus.
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