RESPIRATION 



III 



releasing the carbon dioxide and other waste products 

 resulting from the oxidations. Heat is developed in both 

 plants and animals. The condensation of water-vapor 

 from the breath shows that water is formed in animal 

 respiration, and careful, delicate experiments have also 



Carbohydrates 

 Plant proteins 

 Pats . 



Fig. 71. — The carbon cycle. 



shown that water is formed in plant respiration. In 

 both plants and animals respiration converts potential 

 energy (in the form of complex chemical compounds) into 

 kinetic energy — manifest in motion, locomotion, and the 

 overcoming of resistance of various kinds (that is, work). 

 The two processes are compared in the following table: 



