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During breathing,
air comes in through the nose or mouth and enters the large windpipe,
or trachea. The trachea divides into smaller airways, called bronchi,
which branch out into even smaller airways, the bronchioles, which
are spread throughout the lungs. These small airways end in sac-like
structures called alveoli.
These
airways "work both ways," carrying oxygen into the lungs and transporting
carbon dioxide and other gaseous wastes out. The exchange occurs in
the alveoli, which absorb the oxygen into the body and release the
gaseous wastes to be taken up into the lungs and breathed out.
I am stronger on the pitch and have noticed a great improvement in my playing since training with him. Rio Ferdinand
These
airways "work both ways," carrying oxygen into the lungs and transporting
carbon dioxide and other gaseous wastes out. The exchange occurs in
the alveoli, which absorb the oxygen into the body and release the
gaseous wastes to be taken up into the lungs and breathed out. 
