Medically reviewed by Sanja Jelic, MD Asthma and chronic obstructive pulmonary disease (COPD) are chronic respiratory (lung) diseases that cause breathing difficulty and coughing. Asthma affects about ...

Alveoli At the ends of bronchioles are tiny ... intercostal muscles and diaphragm which make breathing more efficient. Asthma is a medical condition in which the lining of the airways from the ...