xii CONTENTS. 



1'roducts of the Decomposition o 



PAOE 



350. Haemoglobin splits up into lufniatiii and a proteid .... 567 

 351. The features of hwmatiu. H;iuin. Metlm aioglobiu . . . 568 



The relations of the Carboni .!/</ !,, t/,.- 

 352. The carbonic acid of the blood not simply absorbed .... 570 



Tin- fi'/ntt'i'iix i'f tin- Xitrni/i i> in tin IHood. 

 353. The nitrogen simply absorbed ........ 571 



SECTION V. 



TllK IJESl'IRATORY ('HANt.KS IN THE LUNGS. 



354. The relations of the oxygen of the blood to pressure. Association 

 of oxygen with, and dissociation from hii-moglubin. The 

 problem stated ....... ... 572 



ji 355. The experimental evidence ........ 574 



356. The relations of the oxygen in laboured breathing and asphyxia . 575 



Tli>- K.'-it of Carbonic Acid. 



357. The exit of carbonic acid determined by the partial pressure in the 



pulmonary alveoli ......... 575 



SECTION VI. 



THK Kl.M'IRATORY CHAN'.KS IN THK Tl>MK>. 



358. The oxidations of the body take place mainly in the tissues and not 



in the circulating blood. The respiration of muscle . . . 578' 



359. The respiration of other tissues. The taking in of oxygen separate 



from the giving out of carbonic acid ...... 580 



360. A summary of respiration in its chemical aspects .... ~*2 



SECTION VII. 



THE NERVOUS MECHANISM OF RESPIRATION. 



S 361. Respiration an involuntary act. The efferent nerves, the respiratory 



centre ............ 584 



362. The complex nature of the medullary respiratory centre ; the sub- 



sidiary spinal mechanisms ........ 585' 



363. The action of the centre automatic ....... 5Hi; 



364. The centre influenced by afferent impulses. The respiratory action 



of the vagus nerve. Inhibitory and augmentor effects . . 587 

 365. The double action of the centre, inspirator? and expiratory. Antag- 



onism between the two . . . - . 591 



