Our data suggest that the active substance delivered by vascular endothelial cells not only influences the contraction process of smooth muscle ,but also influences its the vasdilator process,and proteced the tension of vascular smooth muscle.

• 提示血管内皮细胞释放的活性物质不仅影响平滑肌的收缩过程，也影响其舒张过程。 血管内皮细胞对平滑肌张力有保护作用。