IKi THE RESPIRATION 



very deiinitc changes occur at the time the relief is experienced — namely, 

 a sloAviiiii and steadying of the previously much quickened and irregu- 

 lar pulse, sweating, and a marked fall in the respiratory quotient. T he- 

 last mentioned change possibly gives a clue to the cause of the others. 

 In the early stages /.'. Q. is raised, which indicates that relatively more 

 C0 2 is being expelled from the blood into the alveolar air than oxygen 

 is being absorbed, perhaps because of inadequate movement of blood 

 through the lungs. At the time of the adjustment it is possible that a 

 pronounced vasodilatation occurs in the muscles and coronary arteries. 

 The former change by lowering the arterial blood pressure Avill relieve 

 the pumping action of the heart, and the latter will improve its power of 

 contraction by supplying it with more oxygen. 



RESPIRATION REFERENCES 



(Monographs) 



Barcroft, J.: The Respiratory Function of the Blood, University Press, Cambridge, 

 1914. 



"Borrutau, H.: Nagel's Handbuch der Physiologie, 1905, i, 29. 



Douglas, C. G.: Die Regulation der Atmung beim Menschen, Ergebnisse der Physiol- 

 ogie, 1914, p. 338. 



Hill, Leonard: Caisson Sickness, International Medical Monographs, E. Arnold, 

 London, 1912. 



Keith, Arthur: The Mechanism of Respiration in Man, Further Advances in Physi- 

 ology, E. Arnold, London, 1909. 



Schenck, F.: Innervation der Atmung, Ergebnisse der Physiologie, 1908, p. 65. 



(Original Articles) 



iKeith, Arthur: Cf. Further Advances. 



-'Hoover, C. F.: Arch. Int. Med., 1913, xii, 214; ibid., 1917, xx, 701. 

 3Lee. F. S., Guenther, A. E., and Meleney, H. F.: Am. Jour. Physiol., 1916, xl, 446. 

 •»Meltzer, S. J.: Jour. Physiol., 1892, xiii,*218. 



•'■Haldane, J. S., and Priestley, J. G.: Jour. Physiol., 1905, xxxii, 225. 

 Haldane and Douglas: Ibid., 1913, xlv, 235. 

 ^Henderson, Y., Chillingworth and "Whitney: Am. Jour. Physiol., 1915, xxxviii, 1. 



Henderson and Morriss: Jour. Biol. Chem., 1917, xxx, 217. 

 T Krogh, A., and Lindhard: Jour. Physiol., 1913, xlvii, 30; ibid., 1917, li, 59. 

 sPearce, R. G.: Am. Jour. Physiol., 1917, xliii, 73; ibid., 1917, xliv, 369. 

 '-'Siebeck, R.: Skand. Arch. f. Physiol., 1911, xxv, S7; Carter, E. P.: Jour. Exper. 



Med., 1914, xx, 21. 

 Peabody, P. W., and Went worth, J. A.: Arch. Int. Med., 1917, xx, 443. 

 "Lewis, T.: Jour. Physiol., 1908, xxxiv, 213, 233. 

 ' -Porter. W. T.: Jour. Physiol., 1895, xvii, 455. 

 ^Christiansen and Haldane, J.: Jour. Physiol., 1914, xlviii, 272. 

 "Boothbv, W. M., and Berry, F. B.: Am. Jour. Physiol., 1915, xxxvii, 433; also 



Boothby, W. M., and Shamoff, V. N.: Ibid., p. 418. 

 i^Alcock, N. H., ami Seemann, J.: Jour. Physiol., 1905, xxxii, 30. 



Scott, F. H.: Jour. Phvsiol., 1908, xxxvii, 301. 

 "Stewart, G. N., and Pike, F. H.: Jour. Physiol.. 1907, xx. 61. 

 "aCoombs, H. C, and Pike, F. H.: Proc. Soc. Exper. Biol. Med., 1918, xv, 55. 

 isRrogh, A.: Skand. Arch. f. Physio]., 1910, xxiii, 248; and A. Krogh with Marie 

 Krogh, ibid., 179. 



