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What are alveoli?
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Alveoli are the tiny air sacs at the end of the smallest air passages in the lungs. There are millions of alveoli in each lung. Oxygen particles from the air seep through the walls of the alveoli into blood vessels, to be taken to the heart. The blood also passes carbon dioxide to the alveoli, to be breathed out. | | Each of our lungs has about 300 million alveoli. Oxygen passes from the alveoli into the bloodstream. |
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Previous:
Back
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Book:
1001
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Section:
Human World
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Chapter:
Human Body: Organs
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