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What is considered the main trunk of the respiratory system?

Since this is not my area of expertise, I searched Google under the key words "'respiratory system' main trunk" to get these possible sources:

http://en.wikipedia.org/wiki/Respiratory_system
http://www.answers.com/topic/respiratory-system

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.

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