Methods: Adding SNP in the organ both from 10 -7 M to 10 -3 M ,the tension and cAMP? cGMP of isolated trachea spiral strip,and the nitric oxide in organ both were observed.

• 方法 :在浴槽内加入硝普钠从10 - 7M至 10 - 3M ,观察气管螺旋条张力的变化 ,并检测浴槽中NO ,气管螺旋条组织cAMP、cGMP的变化。