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Relationship between blood-oxygen affinity and blood volume.
1Department of Physiology, Dartmouth Medical School, Hanover, New Hampshire.
Respiration Physiology
|March 1, 1991
Summary
Total blood volume (TBV) increases with hemoglobin oxygen affinity. This suggests that higher blood volume may help explain how animals tolerate low oxygen conditions.
Area of Science:
- Physiology
- Comparative Biology
- Biochemistry
Background:
- Hemoglobin oxygen affinity (P50) is crucial for oxygen transport.
- Total blood volume (TBV) is a key physiological parameter.
- The relationship between TBV and hemoglobin oxygen affinity requires further elucidation.
Purpose of the Study:
- To investigate the correlation between total blood volume and hemoglobin oxygen affinity.
- To determine if changes in hemoglobin oxygen affinity influence total blood volume.
- To explore the physiological mechanisms underlying hypoxic tolerance.
Main Methods:
- Intraspecific study: Rats' hemoglobin oxygen affinity was altered using sodium cyanate (NaOCN).
- Interspecific study: Literature data on various species were analyzed.
- Measurements included total blood volume, red blood cell mass, hematocrit, and plasma volume.
Main Results:
- Both intraspecific and interspecific analyses showed that total blood volume increases with higher hemoglobin oxygen affinity.
- Intraspecifically, decreased P50 (higher affinity) correlated with increased red blood cell mass and hematocrit.
- Interspecifically, plasma volume inversely correlated with hemoglobin oxygen affinity, while hematocrit remained unchanged.
Conclusions:
- Increased total blood volume may be a compensatory mechanism for enhanced hypoxic tolerance.
- The study highlights distinct intraspecific and interspecific relationships between blood volume components and hemoglobin oxygen affinity.
- Findings contribute to understanding the physiological adaptations to varying oxygen availability.
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