Fig. 5. Membrane potential of the rat aorta without endothelium in the presence of levcromakalim (10−7m) in combination with U46619 (3 × 10−8m) treated with or without Tiron (10 mm), apocynin (1 mm), or propofol (10−6m). The data were expressed as means ± SD; n refers to the number of rats from which the aorta was taken. Difference between the control aorta and the aorta treated with apocynin, propofol, or Tiron is statistically significant (* P < 0.05).