The words "respiratory" and "respiration" refer to the lungs and breathing.
Lungs - illustration
Upper respiratory tract - illustration
Upper respiratory tract
Lower respiratory tract - illustration
Lower respiratory tract
Review Date: 11/9/2014
Reviewed By: Jennifer K. Mannheim, ARNP, Medical Staff, Department of Psychiatry and Behavioral Health, Seattle Children's Hospital, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.