Figure 4.

HE staining of the lung tissues in rats. A: In the normal group, slight infiltration of inflammation was observed in the alveolar mesenchyma. B: In the BAPN group, slight oedema was observed in the alveolar space and infiltration of inflammatory cells in the alveolar mesenchyma. C: In the BAPN+Ang II group, obvious oedema and infiltration of inflammatory cells alveolar atrophy and collapse was observed together with compensatory emphysema in part of the pulmonary alveolus. The images were observed with a magnification of 200×.