Fig. 6. The relationship between F³⁴⁰:F³⁸⁰and force during exposure to (A , n = 5) 10 μm acetylcholine (ACh) or (B , n = 5) 40 mm KCl, plotted from the data presented in figures 5 and 7. Closed circles indicate values measured during the initial exposure to CaCl², open circles indicate values measured in the presence of hexanol (5.5 and 2 mm for ACh and KCl-exposed strips, respectively), and gray circles indicate values after washout of hexanol. Values are mean ± SD, expressed as a percentage of the initial response to CaCl²(2.4 mm and 0.8 mm for ACh and KCl-exposed strips, respectively).