Asthma is defined as irreversible airflow obstruction resulting from chronic airway inflammation. 1. An influx of Th2 lymphocytes occurs in the late airway response to inhaled allergen challenge of...

Asthma is defined as irreversible airflow obstruction resulting from chronic airway inflammation.

1. An influx of Th2 lymphocytes occurs in the late airway response to inhaled allergen challenge of people with asthma and atopy.

2. The β2-adrenoceptor agonists are effective in preventing exercise-induced asthma.

3. The β2-adrenoceptor agonists have no effect on mucus clearance.