Lung anatomy

hollow cavity found in the lungs

The bronchioles ( ) are the smaller branches of the bronchial airways in the lower respiratory tract. They include the terminal bronchioles, and finally the respiratory bronchioles that mark the start of the respiratory zone delivering air to the gas exchanging units of the alveoli. The bronchioles no longer contain the cartilage that is found in the bronchi, or glands in their submucosa.

part of respiratory system of birds

cell type

cell type

portion of lung supplied by a segmental bronchus

hole of alveolar septum

Anatomical structure

secretory organelle