Figure 2.

(a) Typical tracing showing contractile effect of 5-hydroxytryptamine (10^-9−10^-3 M) on the spontaneous contractions in isolated rat fundus. (b) Typical tracing showing inhibitory effect of Zanthoxylum alatum n-hexane extract (30, 100, 300, and 1000 μg/ml) on the spontaneous contractions in isolated rat fundus. (c) Comparison of dose–response curves of 5-hydroxytryptamine in the absence and presence of antagonist ketanserin and Zanthoxylum alatum n-hexane extract on isolated rat fundus. Values are mean ± standard error mean (n = 4)