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Figure 1: Cumulative log concentration-response curves of metacholin induced contraction of guinea pig tracheal chains, in the presence of saline, three concentrations of aqueous-ethanolic extract and 10 nM atropine in (a) non incubated trachea (group 1, open symbols, n = 6), (b) incubated trachea with 1 μM chlorpheniramine and 1 μM propranolol (group 2, filled symbols, n =9) and (c) on tracheal chains incubated with propranolol (Group 3, open symbols with a dot, n =7)

Figure 1: Cumulative log concentration-response curves of metacholin induced contraction of guinea pig tracheal chains, in the presence of saline, three concentrations of aqueous-ethanolic extract and 10 nM atropine in (a) non incubated trachea (group 1, open symbols, <i>n</i> = 6), (b) incubated trachea with 1 μM chlorpheniramine and 1 μM propranolol (group 2, filled symbols, <i>n</i> =9) and (c) on tracheal chains incubated with propranolol (Group 3, open symbols with a dot, <i>n</i> =7)