Fig. 5.

Concentration-response curves of bovine tracheal strips pre-contracted with 65 mM KCl (high K⁺, A) and 100 nM carbachol (CCh, B) to BAY 73-6691 (●) and vardenafil (■). Mean ± SEM (n=4). Pre-contraction induced by high K⁺ at 10 min was considered to be 100% or resting tension was considered to be 0%.