What is the lining of the lungs?

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The lining of the Lungs is called the pleura, it is a lubricating fluid that makes sure the lungs don't scrape against the ribs.
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Why would a lung lining thicken?

The condition that causes the lungs to thicken is interstitum lungdisease. The interstitum is a lace-like network of tissue that canbecome inflamed or scarred and that us what