WEST 



(S) 



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 O 



< 

 LlI 



TEMPERATURE 



Figure 3. Classical picture of partition of chemical and physical thermoregula- 

 tion, showing the thermoneutral zone (ABB'), the critical temperature (B, B'), and 

 metabolism slopes (BCD, B'C'D') that extrapolate to body temperature (T). (Hart, 

 1957). 



296 



