_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