Respiratory system
From DrKoop's partner site on asthma, MyAsthmaCentral.com
When you breathe in, air first travels through the nasal passageway or mouth, through the trachea, which further divides into bronchi, then smaller bronchioles, finally ending in the tiny air sacs (alveoli) in the lungs.
Review Date: 04/21/2006 ![]() advertisement
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