Figure 7: Histological analyses in the brain tissues in rats treated with ZnO-NPs (10mg/kg) for 5 consecutive days. B1control group, the histological analyses in the brain tissuesdid not show significant changes in morphology and nuclei of neurons were observed (N). B2 treated group showing congestion of vascular (asterisk) and edema (round). (B1, B2 magnification x400).