bronchial mucosa with sputum

allergic allergy alveoli anatomical anatomy asthma asthmatic biological breathe bronchi bronchial bronchiales bronchiolar bronchiole bronchus cell chest chronic cilia clearance cough disease drawing expectoration goblet health healthy human immunity infection inflamed inflammation larynx lung medical medicine mucociliary mucosa mucosal mucus oral physiology respiration respiratory scheme science scientific sputum trachea vector