io2 INTRODUCTION TO GENERAL PHYSIOLOGY 



ture is raised, the various means for increasing loss of heat and 

 decreasing its production are set to work. If the temperature is 

 lowered, those for decreasing loss and for increasing production are 

 set to work. 



The mechanism for controlling loss of heat appears to have 

 been developed later in the course of evolution than that regulating 

 production. It seems natural that an animal, finding itself getting 

 too hot from exercise, should diminish first of all the amount of 

 heat being produced, if circumstances permit becoming quiet. 



