![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Respiratory bronchiole
When the wall of a terminal bronchiole becomes interrupted by alveoli, the resulting structure is termed a respiratory bronchiole because gaseous exchange occurs at the level of the alveoli. This image shows a terminal bronchiole becoming a respiratory bronchiole with three attached alveoli. 40x
![Terminal bronchiole <p>When the wall of a terminal bronchiole becomes interrupted by alveoli, the resulting structure is termed a respiratory bronchiole because gaseous exchange occurs at the level of the alveoli. This image shows a terminal bronchiole becoming a respiratory bronchiole with three attached alveoli. 40x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.RB_.05.P01.png)
Terminal bronchiole
When the wall of a terminal bronchiole becomes interrupted by alveoli, the resulting structure is termed a respiratory bronchiole because gaseous exchange occurs at the level of the alveoli. This image shows a terminal bronchiole becoming a respiratory bronchiole with three attached alveoli. 40x
![Respiratory bronchiole <p>When the wall of a terminal bronchiole becomes interrupted by alveoli, the resulting structure is termed a respiratory bronchiole because gaseous exchange occurs at the level of the alveoli. This image shows a terminal bronchiole becoming a respiratory bronchiole with three attached alveoli. 40x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.RB_.05.P02.png)
Respiratory bronchiole
When the wall of a terminal bronchiole becomes interrupted by alveoli, the resulting structure is termed a respiratory bronchiole because gaseous exchange occurs at the level of the alveoli. This image shows a terminal bronchiole becoming a respiratory bronchiole with three attached alveoli. 40x
![Pulmonary arteries <p>When the wall of a terminal bronchiole becomes interrupted by alveoli, the resulting structure is termed a respiratory bronchiole because gaseous exchange occurs at the level of the alveoli. This image shows a terminal bronchiole becoming a respiratory bronchiole with three attached alveoli. 40x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.RB_.05.P04.png)
Pulmonary arteries
When the wall of a terminal bronchiole becomes interrupted by alveoli, the resulting structure is termed a respiratory bronchiole because gaseous exchange occurs at the level of the alveoli. This image shows a terminal bronchiole becoming a respiratory bronchiole with three attached alveoli. 40x
![Alveoli > <p>Three alveoli (black X’s) form an integral part of this respiratory bronchiole. Surrounding alveoli (blue X’s) belong to other respiratory bronchioles or alveolar ducts.</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.RB_.05.P03.png)
Alveoli >
Three alveoli (black X’s) form an integral part of this respiratory bronchiole. Surrounding alveoli (blue X’s) belong to other respiratory bronchioles or alveolar ducts.
![Macrophages > <p>Macrophages, filled with phagocytosed black carbon particles, are located in the connective tissue surrounding the respiratory passageways.</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.RB_.05.P05.png)
Macrophages >
Macrophages, filled with phagocytosed black carbon particles, are located in the connective tissue surrounding the respiratory passageways.