Fig.
5.8 Effects of aging on alveoli: (a) young alveoli. (b) old alveoli. (Source of
image below. Used with permission.)
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https://commons.wikimedia.org/wiki/File:Human_respiratory_system-NIH.PNG
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Description English: Diagram of the human respiratory system.
Date 20
February 2013, 12:00:33
Source http://www.nhlbi.nih.gov/health/health-topics/topics/hlw/system.html
Author United States National Institute of Health: National Heart, Lung and
Blood Institute
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Modified: A.G. DiGiovanna
Obscured interalveolar septa