Lee emus wee om oem ol NPs {a) NPp fy 3Qy NASOPHARYNGEAL REGION TB {c) BLOOD | 1By C fD4Qy 0, (d) | | fgD4Q] peeves nneeee ! ; L TRACHEOBRONCHIAL REGION (fl I ‘ } i (i) { : G.1. TRACT (g) I feDsQy p frO5Qr g FDsQy 4 fg0sQ tom | £7} Mi ! ME i PULMONARY REGION j LYMPH! Loe te LL FIGURE 3. SCHEMATIC DIAGRAM OF THE TASK GROUP LUNG MODEL From Houston et al., 1975 519