CHAPTER VII 



RESPIRATION AND THE PRODUCTION OF ENERGY IN 



MAN 



I. NECESSITY FOR RESPIRATION 



172. To prove that oxidation takes place in the human 

 body. 1 Laboratory study. 



A . Development of heat in the human body. 



Secure two chemical thermometers that approximately 

 agree at the room temperature. Support one of the ther- 

 mometers so that it hangs free in the air ; clasp the bulb of 

 the other thermometer in the palm of the hand for several 

 minutes. 



1. Describe the experiment as it was performed. 



2. Note and record the temperature as indicated on each 



of the thermometers. 



3. What evidence have you that heat is produced in the 



human body ? 



B. Production of carbon dioxid in the human body. 



Blow the breath through a tube into a bottle or test 

 tube of lime water. 



1. Describe what was done. 



2. What proof have you that carbon dioxid is given off 



from the body? 



3. What element found in foods and protoplasm must 



be oxidized in order to produce carbon dioxid? 



1 The student should review P. B., 75 (to prove that heat energy 

 is developed in growing seedlings) and P. B., 81 (to prove that car- 

 bon dioxid is formed during the growth of seedlings). 



122 



