Safety Evaluation of the Polyherbal Formulation NawaTab: Acute and Subacute Oral Toxicity Studies in Rats

Figure 2

Light micrographs of lung tissues in control rats (a) and rats treated with 250 (b), 500 (c), and 1000 (d) mg/kg BW of NawaTab showing the distal part of the conducting portion and respiratory portion. Light micrographs of lung tissues showing normal structure of alveoli (A) with thin interalveolar septum (arrowhead) in all experimental groups, including control (e), 250 (f), 500 (g), and 1000 (h) mg/kg BW of NawaTab. The terminal bronchiole (TB) contained folded columnar epithelial cells that were surrounded by a smooth muscle layer. The respiratory bronchioles (RB) continuing from the terminal bronchioles, had some alveoli (A) along their walls. BV: blood vessel.