
Pulmonary artery
This terminal bronchiole transitioning to a respiratory bronchiole is accompanied by a branch of the pulmonary artery. This vessel is located adjacent to the passageway rather than being located within the wall of the passage as a bronchial vessel would be. 150x

Passageway
This terminal bronchiole transitioning to a respiratory bronchiole is accompanied by a branch of the pulmonary artery. This vessel is located adjacent to the passageway rather than being located within the wall of the passage as a bronchial vessel would be. 150x

Pulmonary artery
This terminal bronchiole transitioning to a respiratory bronchiole is accompanied by a branch of the pulmonary artery. This vessel is located adjacent to the passageway rather than being located within the wall of the passage as a bronchial vessel would be. 150x

Alveoli
This terminal bronchiole transitioning to a respiratory bronchiole is accompanied by a branch of the pulmonary artery. This vessel is located adjacent to the passageway rather than being located within the wall of the passage as a bronchial vessel would be. 150x