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3. Why is the lung considered as the primary organ of the respiratory system?

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Because its the area that blood picks up oxygen and drops off carbon dioxide. There are also many reactions in the lungs.
User Jcs
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The lungs are the primary organs as they carry out the gas exchange that occurs when we breathe. The lungs collaborate with the circulatory system to provide oxygen-rich blood to all of the body's cells.

- I hope this helps sorry in advance if it doesn’t (:
User Joel Hinz
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