How are bronchioles different?

The amount of cartilage in the walls of the bronchi gradually decreases and disappears after the point where the bronchi divide into smaller airways called bronchioles. The bronchioles are the small terminal branches of the airways in the lungs. They have a diameter of less than one millimetre.

What is the difference between the bronchi and bronchioles?

Bronchi are the main passageway into the lungs. ... The bronchi become smaller the closer they get to the lung tissue and are then considered bronchioles. These passageways then evolve into tiny air sacs called alveoli, which is the site of oxygen and carbon dioxide exchange in the respiratory system.