Consists of bronchial capillaries, basal laminas and type 1 alveolar cells

Occurs at the terminal bronchiolar epithelium 

Consists of pulmonary vessels and type II alveolar epithelial cells

Consists of pulmonary capillary endothelium, fused basal laminas and type 1 alveolar cells

Occurs at the visceral pleura only, which is the deepest part of the conducting airway

Cartilage, muscle, vessels of lung develop from splanchnic mesoderm

Each lung is covered directly with parietal pleura except at the hilum

The embryonic lungs grow into a cavity called the pericardium

All respiratory passages are lined internally by a columnar epithelium

The lungs develop as primitive buds from the endoderm of midgut