COMPARISON OF STEAM ENGINE AND MUSCLE CELL 283 

 Results of Combustion in — 



The Steam Engine 



1. Energy iu form of heat. 



2. Carbon dioxide as result of 



the union of the carbon in 

 the fuel with the oxygen. 



3. Wastes in tlie form of aslies 



or other unoxidizable ma- 

 terial. 



The Jluscle Cell 



1. Energy in form of heat. 



2. Carbon dioxide as the result 



of the union of the carbon 

 in the fuel with the oxygen. 



3. Wastes in form of lactic acid, 



urea, etc. 



Disposal of the Products of Combustion in - 



The steam Engine 



The Muscle Cell 



1. Part of the heat energy 

 transforms the water in a 

 boiler to steam and shows 

 itself in the power of expan- 

 sion that this steam has. If 

 this expansion is allowed to 

 act upon a piston rod it is 

 transformed into motion. 



2. Part of the heat energy is 



lost as heat, and merely 

 warms the surrounding air 

 and parts of the engine. 



3. The carbon dioxide passes 



off with the smoke through 

 the chimney or smoke stack. 



4. The wastes pass out partly 

 as smoke through the chim- 

 ney, and partly as ashes 

 into the fire box. 



1. Part of the heat energy acts 



upon the fibrils (sarco- 

 styles) or other contractile 

 matter in the cell and 

 causes it to shorten. The 

 result is a shortening of the 

 whole cell, i.e., contraction 

 or motion. When the heat 

 supply stops, this contrac- 

 tOe matter relaxes. 



2. Part of the heat energy 



escapes as heat, and thus 

 raises the temperature of 

 the body. 



3. The carbon dioxide passes off 



in the blood and is removed 

 from the body by the lungs 

 and skin. 



4 The wastes are carried off by 

 the blood and Ijrmph and 

 removed from the body by 

 the excretory organs, skin 

 and kidneys. 



