(A) Contractile responses of strips related to single-dose ATP (10–3 M) in the control (n = 9) and diabetic (n = 9) groups. (B) Contractile responses of strips related to single-dose KCl (120 mM) in the control (n = 9) and diabetic (n = 9) groups. The differences in contractile responses between groups were not statistically significant (P > .05). Each data point represents mean ± SEM.