Adenoids are the lymphoid tissues in which:

....... is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased.

$A$: Asthmatic patients use bronchodilator drugs as well as inhalers for symptomatic relief.
$R$: Asthma is characterized by the spasm of smooth muscles in the wall of bronchioles due to allergens.

Which of the following is a disease that affects the respiratory system?

Smoking leads to which of the following changes in the blood?

What is correct for emphysema?