pneumonia - normal alveoli vs pneumonia

air alveoli anatomy apnea asthma biology body bronchi cartoon cavity chest chronic clipart collapsed condition detail detailed diaphragm disease drawing health healthcare healthy human ill illustration inflammatory internal layers lung lungs medical medicine membrane normal obstruction organ pain physiology pleura pleurae pleural pneumonia pneumothorax problem pulmonary ray respiration respiratory ribs science serous sick sleep space spine structure surgery system thoracic thorax view wall