ATHENAIS, ISM / SCIENCE PHOTO LIBRARY ATHENAIS, ISM / SCIENCE PHOTO LIBRARY
Lung airways. Coloured X-ray of the lungs with the airways (bronchioles) revealed by the use of a contrast medium (bronchography). The bronchioles are the branching blue structures, shown on a red background. Each lung consists of bronchioles that branch off in a tree-like fashion from the lung's bronchus. The bronchioles narrow the further they are from the bronchus, eventually ending in groups of tiny air sacs called alveoli (not seen at this scale). The lung bronchi join to form the trachea (windpipe), that brings air from the mouth. These bronchioles are intermediate structures, bringing air from the bronchi to the alveoli. The oxygen in the air passes into the blood in the alveoli.
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