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Understanding the Body [Risc OS]
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1995-06-23
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The Lungs
Tubes called the bronchi enter the lungs, one leading to each. The bronchi divide like the branches of a tree into smaller tubes called bronchioles.
Bronchioles have bubble like sacs at the end called alveoli.
Blood vessels surrounding alveoli absorb oxygen into the blood and release carbon dioxide given out by cells.