Why doesn’t the lungs collapse even after forceful expiration

Answers (1)

Our lungs does not collapse even after forceful expiration because  they do not ever full or empty of air completely. There will always be a small amount of air that will  remain in the lungs no matter how hard we try to expel air out of them via forceful expiration.

 

 

 

 

 

 

 

 

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