Figure 2.

Relaxant effect of ethanolic extract of the leaves of Nyctanthes arbortristis on pre-constricted tracheal smooth muscle with histamine. Data are expressed as means ± SEM, n = 7, ^*Ethanolic extract vs. control, ^**P < 0.01, ^***P < 0.001, †Nω-nitro-l-arginine methyl ester + ethanolic extract vs. ethanolic extract, †P < 0.05, ††P < 0.01