This link gives a good 3D image of how air travels through the lungs. As we understand more about lung structure it is easy to understand lung function, and how we can best manage the different lung conditions that commonly occur. The lung airways divide around 23 times between your trachea and the 170,000  airsacs per cubic cm where oxygen and carbon dioxide are exchanged between the blood and the air.

There is more information in my lung structure article.

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