1.Convoluted invaginations of the cell membrane form specialized structures called mesosome which function in the formation of cross-wall during cell division。

1.膜卷曲，内陷可形成有的结构，称介体。其功能分裂有关。

2.The process involves extension and invagination of the plasma membrane to form small vesicles in pinocytosis (pinocytotic vesicles) or vacuoles in phagocytosis (food vacuoles).

2.内吞过程涉及到膜的延伸和内陷。