Why is normal exhalation passive?

Why is normal exhalation passive?

 
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A normal FEV1% was seen with _______.

A normal FEV1% was seen with _______.

 
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Which of the following is(are) obstructive conditions?

Which of the following is(are) obstructive conditions?

 
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The pressure in the pleural cavity is called the _______.

The pressure in the pleural cavity is called the _______.

 
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