The topic bronchiole is discussed in the following articles:
respiratory diseases    • TITLE: respiratory disease (human
disease)     SECTION: Diseases of the smaller bronchi and
bronchioles     It is in the smaller bronchi that major
obstruction commonly occurs in asthma: these bronchi contain
smooth muscle in their walls, and the muscle may contract,
causing airway obstruction. The small radicles of the bronchial
tree, the bronchioles, are commonly involved in infective
processes such as viral infections; they are also the primary
site of deposition of inhaled dust and particles.... structure
of     • TITLE: lung (anatomy)     ...lung; the resulting system
of tubules resembles an inverted tree. The diameters of the
bronchi diminish eventually to less than 1 mm (0.04 inch). The
branches 3 mm and less in diameter are known as bronchioles,
which lead to minute air sacs called alveoli (see pulmonary
alveolus), where the actual gas molecules of oxygen and carbon
dioxide are exchanged between the respiratory spa