Figure 1. A cross-sectional view of exposure chamber (50×50×50 cm polycarbonate Plexiglas) has been shown. All rabbits were located into this chamber for exposure to noise pollutant (N group) and control group for 8 hr per day during 5 consecutive days. Exposure to noise has been carried out through a noise loudspeaker mounted on the roof of the chamber. Control group is just posed onto the chamber resembled to other groups with identical situations, but without any exposure.