Vesicle

Definition

A vesicle is a small, membrane-bound sac within cells that transports substances. Vesicles play critical roles in processes such as transport of lipids and proteins, and in cellular communication.

5 Must Know Facts For Your Next Test

1. Vesicles are essential for the transport of molecules like proteins and lipids between organelles.
2. They are involved in endocytosis and exocytosis, processes that allow cells to intake and expel materials.
3. Some vesicles, known as lysosomes, contain enzymes that break down waste materials and cellular debris.
4. In skin infections, vesicles can form as fluid-filled blisters due to microbial activity or immune responses.
5. Vesicle formation is often initiated by lipid bilayer invagination.

Review Questions

Related terms

Endocytosis:

The process by which cells internalize molecules by engulfing them in a vesicle.

Exocytosis: The process by which cells expel molecules by fusing a vesicle with the plasma membrane.

Lipid Bilayer:

A double layer of lipids that forms the core structure of cell membranes, including those surrounding vesicles.