Figure 3. Dose-response curve of the effect of cholecyctokinin (CCK) on secretory amylase activity in pancreatic lobules isolated from control rats. a. Time courses of the secretory amylase activity stimulated by CCK. b. Cumulative amylase activity secretory over the entire 90-min period. Each value represents the mean±SE of data obtained from 6 experiments. CCK significantly enhanced the secretory amylase activity from the concentration of 10 pmol/L, and maximal effect was observed at 1 nmol/L of CCK.