Pulmonary Histology
_Airways Respiratory Zone
_Terminal bronchiole to Respiratory bronchiole - lined by ciliated cells  and CLARA CELLS; by transitional zone to RB, all Clara cells.
_Alveolar ducts/sacs
§Type I cells 90% of alveolar surface
§Type II cells
_Cell types
§CLARA CELLS - produce a component of surfactant and are the bronchiolar reserve cell
§TYPE I CELLS - Thin lining cell for gas exchange
§TYPE II CELLS - surfactant and alveolar reserve cell
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