What are tiny air sacs through which oxygen and carbon dioxide pass in and out of the bloodstream. alveoli bronchi pharynx laryn
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2 answers:
Answer:
Alveoli
Explanation:
Alveoli are the smallest passageway in the respiratory system, <em>they have the shape of tiny balloons or air sacs,</em> and are only one cell thick to allow<em> its main function to happen, an easy passage of oxygen and carbon dioxide between alveoli and blood vessels (capillaries).</em>
I annexed an image of alveoli sos you can see how they are shaped and how they work.
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