Answers

2016-06-19T14:19:59+08:00
The air we breathe goes through the nose, nasal passages, and then through the trachea, which separates into two branches, called bronchi, one entering each lung. the bronchi subdivide many times inside the lungs, finally becoming hairlike tubes called bronchioles. in the last part of the terminal bronchioles are tiny bubble-like bunch bunch of structures called alveoli
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