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The Structure of the Lungs
The lungs are a pair of spongy, air-filled organs located
in the chest cavity, flanking the heart. They are integral
to the respiratory system and are protected by the
ribcage. Each lung is divided into lobes: the right lung
has three lobes, while the left lung has two, leaving
room for the heart. The lungs are made up of tiny air
sacs called alveoli, where oxygen is exchanged for
carbon dioxide during respiration. These alveoli are
connected to a network of branching tubes called
bronchi and bronchioles, forming a complex tree-like
structure.
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