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Updated: May 27, 2025
If one of the smallest bronchial tubes be traced in its tree-like ramifications, it will be found to end in an irregular funnel-shaped passage wider than itself. Around this passage are grouped a number of honeycomb-like sacs, the air cells or alveoli of the lungs. These communicate freely with the passage, and through it with the bronchial branches, but have no other openings.
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