HEAT IN RELATION TO THE HUMAN BODY 17 



4. Why may death result if the temperature of a per- 

 son's body continues for some time several degrees below 

 normal ? What is evidence of a superabundance of energy 

 in a person? 



5. What in our bodies corresponds to fuel for the engine ? 

 Name several kinds of body fuels. Before these become 

 available as fuel what changes must they undergo in the 

 body? 



6. What part in this heat production has respiration? 

 Where does the oxidizing action go on, and where in the body 

 is heat liberated ? What part in all this has the circulation 

 of the blood? 



7. Recall the effects of vigorous exercise, whether of work 

 or play, upon (a) the rapidity and volume of breathing ; (6) 

 the rate of pulse beat; (c) the temperature of body. Ex- 

 plain the relationship of these conditions. 



8. How much of our thought and attention do the pro- 

 cesses of digestion, respiration, and circulation of blood 

 commonly require? In case we did need to give these ac- 

 tivities our attention, how would it affect us in the affairs of 

 life? 



REGULATION OF BODY TEMPERATURE 



1. Dip the hand into water; then wave it back and forth 

 in the air and note the sensation. Hasten the evaporation 

 by fanning, and observe any difference in the sensation. 

 Whence is derived part at least of the heat necessary to 

 vaporize the liquid? What is true of the temperature of 

 the body when perspiration vaporizes on the skin? 



