what path does the air follow to leave the body

Answer 1

I searched Google under the key words "breathing anatomy" to get these possible sources:

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http://www.leeds.ac.uk/chb/lectures/anatomy7.html
http://www.myfit.ca/archives/viewanarticle.asp?table=fitness&ID=35&subject=Anatomy+of+Breathing
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In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.

I hope this helps. Thanks for asking.