3.Cyclic stretch made orientation of the A549 cells change to the vertical direction of the stretch.Cells were stretched longer and linked head to tail in the form of a line.

• (3)周期性拉伸引起了细胞取向的调整，细胞调整到与主应变近似垂直的方向，许多细胞拉长首尾连成一线，线的取向趋于与主应变方向垂直。