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 
fats 
Intermediate 
Decomposition 
Products 
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: 
