Objectives: To investigate the effect of pinaverium bromide, an L-type calcium channel blocker on the contractile activity of isolated circular muscular strips and longitudinal muscular strips in human transverse colon, and to observe the effect of pinaverium bromide on the contraction of strips, which is induced by Ach. Methods: 1.Normal tissues of the human transverse colon were collected from the left hemicolon carcinoma surgery. Circular muscular strips and longitudinal muscular strips were m...