Figure 3From: Analysis of airway secretions in a model of sulfur dioxide induced chronic obstructive pulmonary disease (COPD)Stimulated secretory activity after 3 days of exposure. The acetylcholine-stimulated secretory activity of rats (for each group n = 4) exposed to either 5, 10, 20, 40, 80 ppm SO2 or fresh air as assessed by the modified Ussing Chamber technique. Results are presented as mean ± SD cpm.Back to article page