It travels down the trachea – or windpipe – into one of two bronchi and into bronchioles before entering one of millions of alveoli, where gaseous exchange takes place. When we breathe out ...

Bronchitis causes inflammation of the bronchi (and bronchioles to a degree) and can affect people of any age. Symptoms common to both bronchiolitis and bronchitis include: With both conditions ...

Clean air then enters the two bronchi, one bronchus going to each lung. The bronchi in the lungs split into smaller and smaller tubes called bronchioles. These end in microscopic air sacs called ...