![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Respiratory bronchiole
An edge of a terminal bronchiole is seen transitioning into a respiratory bronchiole. 100x
![Terminal bronchiole <p>An edge of a terminal bronchiole is seen transitioning into a respiratory bronchiole. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.TB_.06.P01.png)
Terminal bronchiole
An edge of a terminal bronchiole is seen transitioning into a respiratory bronchiole. 100x
![Respiratory bronchiolar wall <p>An edge of a terminal bronchiole is seen transitioning into a respiratory bronchiole. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.TB_.06.P02.png)
Respiratory bronchiolar wall
An edge of a terminal bronchiole is seen transitioning into a respiratory bronchiole. 100x
![- Associated alveoli <p>An edge of a terminal bronchiole is seen transitioning into a respiratory bronchiole. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.TB_.06.P03.png)
- Associated alveoli
An edge of a terminal bronchiole is seen transitioning into a respiratory bronchiole. 100x
![Pulmonary artery <p>An edge of a terminal bronchiole is seen transitioning into a respiratory bronchiole. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.TB_.06.P04.png)
Pulmonary artery
An edge of a terminal bronchiole is seen transitioning into a respiratory bronchiole. 100x
![Macrophages > <p>Macrophages, filled with black carbon particles, are seen scattered in the connective tissue surrounding the bronchioles. Such macrophages are called “dust cells.”</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.TB_.06.P05.png)
Macrophages >
Macrophages, filled with black carbon particles, are seen scattered in the connective tissue surrounding the bronchioles. Such macrophages are called “dust cells.”