The most common chronic lower respiratory disease which occurs when bronchi lose their elasticity is ______________.

Question

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Emphysema is a chronic lower respiratory disease that occurs when the small air sacs in the lungs lose their elasticity, making it difficult to breathe. Acute and chronic bronchitis are also respiratory diseases, but they involve inflammation of the bronchial tubes rather than the loss of elasticity in the air sacs. Lung cancer is a type of cancer that can affect the lungs but is not considered a chronic lower respiratory disease.

The Most Common Chronic Lower Respiratory Disease Which Occurs When