Substance P Regulates Environmental Tobacco Smoke-Enhanced Tracheal Smooth Muscle Responsiveness in Mice : Figure 2

Figure 2: Tracheal smooth muscle contraction was generated by 10⁻⁵ M methacholine (MCh) in 1 day ( in each group) and 5 days ( in each group) SS-(solid bars) or FA-(open bars) exposed tracheal rings. Values are means SE.