RESPIRATION 549 



are still contracted, the pressure in the arteries falls. (4) 

 Finally, the movements of the heart cease and death 

 supervenes. 



Before the heart has stopped, recovery may be brought about 

 by artificial respiration, which may be performed by slow 

 rhythmic compressions of the thorax and abdomen at a rate 

 not exceeding the normal rate of breathing in the animal or 

 by connecting the trachea to a respiration pump. 



