Here's how they form:
* Endocytosis: A portion of the cell membrane invaginates (folds inward) around a substance or particle outside the cell. This invagination eventually pinches off, creating a vesicle containing the captured material.
* Exocytosis: Vesicles formed inside the cell fuse with the cell membrane, releasing their contents outside the cell.
Vesicles are essential for many cellular processes, including:
* Transport: Moving molecules and materials within the cell.
* Signal transduction: Delivering signals between cells.
* Waste disposal: Removing unwanted materials from the cell.
* Cellular communication: Exchanging information between cells.
