![]() |
![]() |
![]() |
|
![]() |
![]() |
![]() |
![]() |
![]() |
Medical Encyclopedia | |||||||||
|
![]() Air is breathed in through the nasal passageways, travels through the trachea and bronchi to the lungs. |
Health Topics | Drug Information | Dictionaries | Directories | Other Resources |
U.S. National Library of Medicine, 8600 Rockville Pike, Bethesda, MD 20894
Copyright and Privacy Policy, We welcome your comments. |