TOPICS: Right lung, left lung, diaphragm, phrenic nerve (C3-C5), respiratory tree, conducting zone, mucociliary escalator, goblet cells, pseudostratified ciliated columnar epithelium, trachea, bronchi, terminal bronchioles, respiratory bronchioles, club cells, type I pneumocytes, type II pneumocytes, respiratory zone, basal cells, ciliated cells, alveolar macrophages, alveolar sacs, surfactant, dipalmitoylphosphatidylcholine (DPPC)