490 Animal Biology 



Right common 

 carotid artery. 



Subclavian 

 arteries. 



Innominate 

 artery. 



Arch of aorta. 



Right lung. 



Superior vena 

 cava. 



Right auricle. 



Larynx. 



— Trachea. 



Subclavian 

 arteries. 



Left lung. 



Pulmonary 

 artery. 



Heart. 



Coronary 

 artery. 



Fig. 243.- — Organs of the human thoracic cavity. (From Turner: Personal and 

 Community Hygiene, The C. \' . Mosby Co.; after Ingals.) 



CARTaAGE") 



cartilageJ 



RIGHT LUMG 



CARTlLAGmOUS RlflGS 



ROnCMUS 



UARYMK 



BROrtCHIOLE 



i^C^AlR SAC 5 



Fig. 244. — Human respiratory system shown in section. The walls of the air 

 sacs are dilated to form alveoli whose thin walls are covered with a network of 

 capillaries for the exchange of gases. (From Zoethout and Tuttle: Textbook of 

 Physiology, The C. V. Mosby Co. ; after Dalton.) 



