Figure 9From: Rat pulmonary responses to inhaled nano-TiO2: effect of primary particle size and agglomeration state Optical microscopy images (400-x) of lung tissue sections. (A) Lung of control rat exposed to compressed air. (B) Lung of a rat exposed to small agglomerates of 5 nm NP. This figure demonstrates TiO2 NP engulfed by alveolar macrophages (arrows).Back to article page