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Where does gas exchange take place?
The journey begins at the trachea. The trachea is divided into two tubes leading into the lungs. Once inside the lungs, the tubes branch out into smaller tubes. The tiniest of these tubes, the bronchi have branches like a tree. These branches empty the air into very thin-walled air sacs, called alveoli. The walls of the alveoli are so thin that gases like oxygen and carbon dioxide can pass through them by diffusion. Diffusion is he movement of particles from areas of high concentration to low concentration.
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