138 RESPIRATION 



What is the amount of O-2 and COa in the blood? 



What factors bring the C>2 of the air to the alveoli of the lung? 



What are cardiopneumatic movements? 



Explain what is meant by the partial pressure of a gas. 



Explain in detail the diffusion of Qi from the outer air into the alveoli. 



In what ways are the gases of the blood held? 



What factors govern the amount of a gas absorbed by a liquid? 



What is meant by the coefficient of absorption? 



In what way is the gas in the blood under tension? 



How much oxygen should the blood take up according to physical laws? 

 Does it in reality hold more or less? 



How is the discrepancy explained? 



What is meant by tension of dissociation? 



How may the respiratory rhythm be affected? 



What is the effect upon the respiration of sectioning the vagi? Of stimu- 

 lation of the central end? 



What are the afferent nerves that control the activity of the respiratory 

 centre? 



What is the effect of excitation of the superior laryngeal and glosso- 

 pharyngeal nerves? 



Through what nerves do irritating gases affect respiration? 



What afferent nerves are involved in respiration? 



What is the effect of sectioning a phrenic nerve? 



Give the effect of sectioning the cord just below the fifth spinal nerve. 



Discuss the condition of the respiratory centre in the fetus. 



What nerves are distributed to the lung tissue? 



Discuss the kinds of fibers in the vagus which are supplied to the bronchi. 



What does stimulation of the central and peripheral ends of the fibers 

 bring about? 



Define sighing, hiccough, cough, sneezing, speaking, singing, sniffing, 

 sobbing, laughing, yawning, and sucking. 



