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Pulmonary metabolism during diving: conditioning blood for the brain
Science (New York, N.Y.)
|November 25, 1977
Summary
During experimental dives, Weddell seals show falling blood glucose levels. Their lungs use blood lactate for energy and release glucose to support brain metabolism.
Area of Science:
- Marine biology
- Animal physiology
- Comparative metabolism
Background:
- Weddell seals exhibit unique physiological adaptations for prolonged diving.
- Understanding substrate utilization during diving is crucial for marine mammal physiology.
Purpose of the Study:
- To investigate glucose and lactate metabolism in Weddell seals during experimental dives.
- To determine the role of the lung in substrate supply to the brain during diving.
Main Methods:
- Experimental diving in awake Weddell seals.
- Monitoring of blood glucose and lactate concentrations.
- Analysis of substrate utilization by lung tissue.
Main Results:
- Consistent decline in blood glucose concentration during diving.
- Significant portion of consumed glucose appears as lactate.
- Lung preferentially utilizes blood lactate for carbon and energy.
- Lung releases glucose into pulmonary venous blood.
Conclusions:
- The lung plays a vital role in maintaining brain glucose supply during Weddell seal dives.
- Lactate serves as a key metabolic substrate for the lung during diving.
- This metabolic strategy supports prolonged aerobic metabolism in the brain during breath-hold.