Bronchiole Each bronchus splits again and again into thousands of smaller tubes called bronchioles which take the air deeper into the lungs. Alveoli At the ends of bronchioles are tiny air sacs ...

in mucus-producing cells that line the small airways called bronchioles. A few signs of lung cancer that you may notice are: Head And Neck Cancer: Know Signs That Help Identify The Disease ...

At the ends of the bronchioles are little air sacs called alveoli. At the end of the alveoli are capillaries, which are tiny blood vessels. Oxygen moves from the lungs to the bloodstream through ...