364 



THE RESPIRATION 



tFi&txvuA <m, m/m3ta 



Fig. 131. Curves showing variations in alveolar gas tensions after forced breathing for two 

 minutes. Thin line = O 2 tension; thick line CO 2 tension. Double line = normal alveolar 

 CO 2 tension. Dotted line shows the alveolar CO 2 tension at which breathing would recommence 

 at the end of apnea with the alveolar Oz pressures shown by the thin line. The actual breathing 

 is indicated at the lower part of the figure. It is periodic to start with. (From Douglas and 

 Ilaklane.) 



