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Question: what are the lungs made of?
Asked by jhorsnall to Jemma, John, Katie, Lisa on 28 Jun 2012.
answered on 28 Jun 2012:
the lungs are made of billions of cells that form sac-like structures called alveoli. These fill with air when you breathe in and create a huge surface area for oxygen to diffuse across into the blood stream.
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