WebMD
Font Size
A
A
A

Respiratory system

Illustration copyright 2000, 2004 by Nucleus Communications, Inc. All rights reserved. http://www.nucleusinc.com

The main function of the respiratory system is to supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body. The respiratory system does this through breathing.

The upper respiratory tract (upper airway) consists of the nose, mouth, sinuses, pharynx (upper section of the throat), and larynx (voice box). The lower respiratory tract consists of the trachea (windpipe), 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).

Primary Medical Reviewer Kathleen Romito, MD
- Family Medicine
Specialist Medical Reviewer Robert L. Cowie, MB, FCP(SA), MD, MSc, MFOM
- Pulmonology
Last Updated August 31, 2006

WebMD Medical Reference from Healthwise

Last Updated: August 31, 2006
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
@ 1995-2007, Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.