Constricted bronchiolus

Constricted bronchiolus

Contraction of smooth muscle cells surrounding the bronchioles results in bronchoconstriction. This will greatly reduce the size of the lumen and the patient's ability to move air. Cholinergic stimulation or β-adrenergic inhibition can lead to smooth muscle contraction.

1

All bronchi and bronchioles contain striated muscle. 

2

Airway muscle contraction occurs in obstructive lung disease exclusively.