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Every Breath You Take: Inside the Respiratory System

written by: AngelicaMD•edited by: Paul Arnold•updated: 10/18/2011

Normally you don't give it a second thought, but every breath you take is vital and the oxygen it contains travels through a complex system to your body's cells. This guide to the respiratory system explores its structures and functions, what happens when things go wrong, and how they can be fixed.

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