First Time User? Sign Up Now
First Time User? Enroll now.
Home > Health Library > Respiratory system
The upper respiratory tract (upper airway) consists of the nose, mouth, sinuses, pharynx (upper section of the throat), and voice box (larynx). The lower respiratory tract consists of the windpipe (trachea), bronchial tubes, and lungs. The bronchial tubes carry air into the lungs and branch into smaller and smaller bronchioles. These end in alveoli (air sacs).
The main function of the respiratory system is to supply the blood with oxygen so the blood can deliver oxygen to all parts of the body. The respiratory system does this through breathing.
Current as ofSeptember 5, 2018
Author: Healthwise StaffE. Gregory Thompson, MD - Internal MedicineAdam Husney, MD - Family MedicineRobert L. Cowie, MB, ChB, MD, MSc, FCP(SA), MFOM - Pulmonology
Current as of:
September 5, 2018
Medical Review:E. Gregory Thompson, MD - Internal Medicine & Adam Husney, MD - Family Medicine & Robert L. Cowie, MB, ChB, MD, MSc, FCP(SA), MFOM - Pulmonology
To learn more about Healthwise, visit Healthwise.org.
© 1995-2018 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
UNC Medical Center
101 Manning Drive
Chapel Hill, NC 27514
UNC Health Care Citrix
UNC Medical Center Intranet
Copyright 2019 UNC Health Care. All rights reserved.