External considerations Reduction of exposure or accessibility C Consideration of routes of absorption by man animals or aquatic life 1.Skin/eves 2. Lungs 3. Gastrointestinal tract(消化系统) 4.Gills(#B)or other specific routes 四大学化学学院 2002年7月26日四川大学化学学院 2002年7月26日 8 External considerations------ Reduction of exposure or accessibility ◼ C. Consideration of routes of absorption by man, animals or aquatic life ◼ 1. Skin/eyes ◼ 2. Lungs ◼ 3. Gastrointestinal tract（消化系统） ◼ 4. Gills(鳃) or other specific routes