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American Zoologist 1984 24(3):791-807; doi:10.1093/icb/24.3.791
© 1984 by The Society for Integrative and Comparative Biology
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Evolution of Temperature Regulatory Mechanisms1

DOUGLAS O. NELSON, JAMES E. HEATH and C. LADD PROSSER
Departments of Physiology, Surgery and Medicine, Northwestern University Medical School Chicago, Illinois 60611
Departments of Physiology and Biophysics, University of Illinois Urbana, Illinois 61801

Temperature regulation in vertebrates utilizes both behavioral and metaboliccirculatory mechanisms which are under the control of preoptic-anterior hypothalamic structures. Both central and peripheral thermoreceptors exist in all classes of vertebrates, but major differences in their importance in regulating body temperature occur. Within the central nervous system (CNS), structures controlling thermoregulation are highly redundant; subsystems occur at several CNS levels in a hierarchical organization. Thermoregulatory effector mechanisms have not evolved independently, but are derived from pre-existing organ systems which originally evolved for other functions.


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