Respiratory system

Alveolar ducts

Alveolar sac

Alveoli

Alveolus

Branch of pulmonary artery

Branch of pulmonary vein

Bronchial vein, artery, and nerve

Connective tissue

Deep lymphatic vessel

Elastic fibers

Lymph nodes

Parietal pleura

Pleural cavity

Pulmonary capillaries

Respiratory bronchioles

Smooth muscle

Superficial lymphatic vessel

Terminal bronchiole

Visceral pleura