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 ...

The bronchi in the lungs split into smaller and smaller tubes called bronchioles. These end in microscopic air sacs called alveoli. The process of ventilation as a series of changes in pressure ...

To better understand the condition, we should begin with a bit of anatomy. When you breathe in ... These are the bronchi. (For fellow science nerds, each one is called a bronchus.) ...