. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. arte-rialization is thus rapidly and completely tubelet, with the air-cells thus clustered upon it,is a miniature representation of the lung of a cells themselves communicate by lateral apertureswith one another. The membrane lining their interioris sharply folded at the apertures, and there are reasonsfor supposing that it contains organic muscular is stated that each terminal bronchus has nearly20,000 air-cells clustered
. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. arte-rialization is thus rapidly and completely tubelet, with the air-cells thus clustered upon it,is a miniature representation of the lung of a cells themselves communicate by lateral apertureswith one another. The membrane lining their interioris sharply folded at the apertures, and there are reasonsfor supposing that it contains organic muscular is stated that each terminal bronchus has nearly20,000 air-cells clustered upon it, and that the totalnumber is 600 millions. The mode of distribution of the air-tubes is representedin Fig. 64 (page 146). a is the larynx; b 5, the trachea,the upper letter corresponding to the cricoid cartilage; c,the left bronchus ; <#, the right bronchus; e,f, gr, its ram- What is the reason birds are so easily killed by a small shot ? De-scribe the human lung. What is the size of the air-cells ? How arethe blood-vessels arranged between them ? What is the estimatednumber of air-cells ? G 146 STRUCTURE OF THE Human air-tubes. Fig. 65. Fi9- 64- ifications in the right lung;ii/ Aj^rami-fications of the leftbronchus in the leftlung, h Jc. Fig. 65, arrange-ment of the heartand lungs, the latterin part section. 1,left auricle of theheart; 2, right auri-cle; 3, left ventricle;4, right ventricle; 5,pulmonary artery;6vaorta; 7, superiorvena cava; 8,innom-/ inata; 9, left primi-tive carotid; 10, leftsubclavian ; 11, 12,upper rings of tra-chea and cartilagesof the larynx; 13,upper lobe of rightlung; 14, upper lobeof left lung; 15, theright pulmonary ar-tery; 16, 16, lowerlobes of lungs. Fig. 66 illustratesthe manner of dis-tribution of blood-vessels on the air-cells of the lungs. By the aid of thiselaborately con-structed mechanismthe air is broughtto the blood. Thereare three distinctstages throughwhich it has to pass. The first is the filling of the tra- Describe
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Keywords: ., bookautho, bookcentury1800, bookdecade1860, booksubjectphysiology
