Airways and air sacs of the lungs


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Airways and air sacs of the lungs

Illustration showing airways and air sacs of the lungs

Your bronchioles are some of the smallest airways in your lungs. Inhaled air passes through tiny ducts from the bronchioles into elastic air sacs (alveoli). The alveoli are surrounded by the alveolar-capillary membrane, which normally prevents liquid in the capillaries from entering the air sacs.
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