3 years ago

________ are tiny air sacs through which oxygen and carbon dioxide pass in and out of the bloodstream.

1 answer:

6 0

Alveoli. Tiny air sacs at the end of the bronchioles (tiny branches of air tubes) in the lungs. The alveoli are where the lungs and the bloodstream exchange carbon dioxide and oxygen. Carbon dioxide in the blood passes into the lungs through the alveoli. Oxygen in the lungs passes through the alveoli into the blood.

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