A member asked:

Why is breathing in during inspiration not affected by bronchoconstriction (asthma or copd)?

A doctor has provided 1 answer

Pressure.: Long story...essentially, the pressure pushing upon the airways with expiration causes the airways to close upon themselves, causing air trapping which is one of the hallmarks of COPD and the other obstructive lung diseases.

Answered 2/6/2015

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