Fig. 4

Concentration dependent bronchodilator effect of a methanolic extract of Heliotropium strigosum (Hs.Cr) (a, b and c) and (d) verapamil on carbachol (CCh: 1 μM)- and high K⁺ (80 mM)- induced contractions in isolated rabbit tracheal preparations. Values are the mean ± SEM, n = 5