Final answer:
Asthma is a chronic disease that involves inflammation and constriction of the bronchioles, excessive mucus production, and swelling of the respiratory passages. It is triggered by various factors.
Step-by-step explanation:
Asthma is a chronic disease characterized by inflammation and constriction of the bronchioles, resulting in difficulty breathing. This condition is associated with excessive mucus production and swelling of the mucous lining of the respiratory passages. It is triggered by various factors such as allergens, pollutants, respiratory infections, exercise, and stress.