Legend: B - bronchiole; M - smooth muscle cells; Rb - respiratory bronchiole; Tb - terminal bronchiole; Ad - alveolar duct; A - alveoli
Legenda: B - bronhiol; M - glatke mišićne stanice; Rb - respiratorni bronhiol; Tb - terminalni bronhiol; Ad - alveolarni hodnik; A - alveole