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The respiratory system that involves diffusion of oxygen and carbon dioxide directly into and out of cells is ______.
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The respiratory system that involves diffusion of oxygen and carbon dioxide directly into and out of cells is ______.

User Q Liu
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1 Answer

8 votes

Answer:

Alveoli

Step-by-step explanation:

they are very small air sacs which performs the exchange of oxygen and carbon dioxide takes place. CAPILLARIES are blood vessels in the walls of the alveoli.

User Peelz
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