 role alveolar inclus bodi develop lung develop alveolar epithelium man rat characterist inclus bodi heterogen structur basic consist system membran profil limit membran unit type inclus bodi appear result focal cytoplasm degrad occur rapidli chang cuboid alveolar epithelium inclus bodi develop rat lung so-call lamellar transform mitochondria evid present suggest alter cytoplasm membran involv process inclus bodi format imag associ golgi complex interpret earli form inclus bodi evid inclus bodi enlarg accret membran final extrud alveolar space inclus bodi form secret greater number late fetal life earli infanc time cuboid alveolar epithelium differenti matur flatten type inclus bodi basi morpholog characterist inclus bodi distribut acid phosphatas reaction conclud inclus bodi lysosom structur activ remodel develop alveolar epithelium interrelationship inclus bodi pulmonari surfact discuss 