When you breathe, the airway (respiratory) system
supplies oxygen to your blood. Then your blood takes oxygen to all parts of the
The nose, mouth, throat (pharynx and larynx), and hollow
spaces in the cheeks and around the eyes (sinuses) make up the upper
respiratory tract. The windpipe, breathing tubes (bronchial tubes and
bronchioles), and structures inside the lungs make up the lower respiratory
ByHealthwise Staff Primary Medical ReviewerSusan C. Kim, MD - Pediatrics Specialist Medical ReviewerJohn Pope, MD - Pediatrics
Susan C. Kim, MD - Pediatrics & John Pope, MD - Pediatrics
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The Health Encyclopedia contains general health information. Not all treatments or services described are covered benefits for Kaiser Permanente members or offered as services by Kaiser Permanente. For a list of covered benefits, please refer to your Evidence of Coverage or Summary Plan Description. For recommended treatments, please consult with your health care provider.