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 



'-T7 ...'. ;. -. 

 .Bacterial . 

 V :' Decay.'/. ';. 



Carbohydrates 

 Plant proteins 

 .Pats 



Intermediate] 

 Decomposition! 

 Products J 



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: 



