Schematic longitudinal section of a primary lobule of the lung (anatomical unit); - r. b respiratory bronchiole; - al. d alveolar duct; at atria; - a. s alveolar sac; - 'a' alveolus or air cell; - p. a.: pulmonary artery; - p. v pulmonary vein; - l lymphatic; - l. n lymph node.

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Schematic longitudinal section of a primary lobule of the lung (anatomical unit); - r. b respiratory bronchiole; - al. d alveolar duct; at atria; - a. s alveolar sac; - 'a' alveolus or air cell; - p. a.: pulmonary artery; - p. v pulmonary vein; - l lymphatic; - l. n lymph node.