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Which structure of the respiratory system plays the main role in carry out the system’s primary function?
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Which structure of the respiratory system plays the main role in carry out the system’s primary function?

User Jramirez
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The Alveoli - Because the oxygen would enter and exit blood through diffusion through the capillaries here.

Hope this helps!
User Diogo Santo
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That'd be the alveoli! I hope this helps!
User Xserrat
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