When Asthma Attacks

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When Asthma Attacks
Air travels down the trachea, through a series of branching airways known as the bronchi, into smaller bronchioles, and then into tiny air sacs called alveoli.
During an asthma attack, muscle constriction in the bronchi narrows the airways, resulting in reduced airflow to the alveoli. This is further exacerbated by intensified mucus secretions which can clog the smaller bronchioles.
LifeART Collection Images Copyright © 1989-2001 by Lippincott Williams & Wilkins, Baltimore, MD
Constricted
bronchus
Normal
airway
Smooth muscle
in wall
Large amount
of mucus
Bronchus and branches during asthma attack
Metered-dose and dry powder inhalers deliver medicine directly to the lungs
Air