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It is better to say that the following is part of the respiratory system:

It includes the windpipe, the lungs and the nose. The respiratory system lets us breathe in oxygen through the nose, going down through the windpipe to the lungs, and then after it has travelled all around our body, comes up the windpipe into our nose as carbon dioxide as we breathe out. Excretion, blood circulation, thinking and nerve control are all not part of the respiratory system.

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14y ago

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