RESPIRATION. 



12? 



comfort, and is planned and put in place long before these 

 organs are brought into actual use in breathing and in 

 taking food. 



FIG. 38. SECTION OP MOUTH AND THROAT. 

 A, The Tongue. C, Vocal C9rd. N, Trachea. 



B, The Uvula. 



E, Epiglottis. 

 L, Larynx. 



O, (Esophagus. 



6. The air -passages are linea tnrough nearly their 

 whole extent with mucous membrane, which maintains 

 these parts in a constantly moist condition. This meni- 

 brane has a peculiar kind of cells upon its outer stir- 



6. Lining of the air-passages? Ciliated cells? Their uses? The three dis- 

 eases of the lungs ? 



