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_____ are tiny air sacs where oxygen is absorbed.
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_____ are tiny air sacs where oxygen is absorbed.

User Papar
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2 votes

Answer:

ALVEOLI

Step-by-step explanation:

Bronchioles end in tiny air sacs called alveoli, where the exchange of oxygen and carbon dioxide actually takes place. Each person has hundreds of millions of alveoli in their lungs.

User Sebastian Kramer
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