abstract red human bronchial tree structure. lungs anatomy, left and right bronchus, bronchioles, trachea. healthcare

human medical vascular system bronchiolar pneumonia respiratory cancer internal organ bronchiole trachea bronchi pulmonary bronchopulmonary capillaries alveoli lung tract emphysema anatomy pleura parenchyma bronchioles acinus alveolar main bronchus structure bronchial tube chronic obstructive disease bronchitis asthma tuberculosis cystic fibrosis acute sarcoidosis hypertension pleurisy bronchiectasis embolism flu virus coronavirus tree tertiary