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What are alveoli?

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You have hundreds of millions of these tiny delicate sacs in each lung. Inside each one are minute blood vessels called capillaries, through which oxygen gets into your blood and CO2 is taken out. When you have lung disease -- whether from smoking, chemicals, mold, bacteria, or a virus like the one that causes COVID-19 -- it’s often the alveoli that start to break down.

Reviewed by Minesh Khatri on May 15, 2020
Reviewed by Minesh Khatri on May 15, 2020

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What are lungs made of?

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