Chapter VI: How the Blood Is Changed by Air: Breathing

36. “ Venous and Arterial Blood 85

37. “ The change from Arterial to Venous, and from Venous to
Arterial Blood 87

38. “ The Lungs 88

39. “ The renewal of Air in the Lungs. How the descent of the
Diaphragm expands the Lungs 90

40. “ The natural distension of the Lungs. Inspiration. Expiration 91

41. “ How the Diaphragm descends 96

42. “ The Chest is also enlarged by the movements of the Ribs
and Sternum 98

43. “ Breathing an involuntary act 100

44. “ Tidal air; stationary air 101