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by-passing it via alternate circulatory pathways and thereby altering the efficiency of the heat-exchange systems. Following blockage of adrenergic nervous control of the circulation with bretylium, alterations of heat transfer to the brain were eliminated, suggesting active nervous control of the heat-exchanger efficiency to regulate brain temperature.

Although the researchers did not measure significant excess brain temperature during steady-state conditions, they did find that the carotid rete was effective in minimizing heat loss, which would protect the brain (and perhaps eyes) during rapid dives into colder waters. The heat-exchanger could then be turned "off" so that rapid warming could occur upon return to warm surface waters, with the overall effect of regulating more stable, and warmer, brain temperatures in the face of fluctuating environmental temperatures.


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Contact: Donna Krupa
djkrupa1@aol.com
703-967-2751
American Physiological Society
26-Aug-2002


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