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английский) 2:
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lungs are located in the chest. 
The space between the fins is occupied mezhrebrenymi muscles. 
The diaphragm separates the chest from the abdominal cavity. 
The air that we breathe in through the nose or mouth, passes through the airways to the lungs. 
In the alveoli the exchange of gases between the organism and the environment. 
The lengths of the trachea approximately 15 cm. 
Each bronchus enters the lung, where the branch into smaller bronchi and bronchioles. 
in total there are about 300 million alveoli. 
The alveoli braided capillaries. 
The walls of the alveoli are very thin. 
A thin wall and gas exchange occurs
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