extracellular membrane-bounded organelle

Definition

Target type: cellularcomponent

Organized structure of distinctive morphology and function, bounded by a lipid bilayer membrane and occurring outside the cell. [GOC:isa_complete]

Extracellular membrane-bounded organelles are compartments enclosed by a membrane that are located outside of the cell. These organelles are often involved in secretion, uptake of nutrients, and other processes that require interaction with the external environment. The specific components of these organelles vary depending on the type of cell and its function, but some common features include:

* **Membrane:** The outermost layer of the organelle, which provides structural support and regulates the passage of molecules into and out of the organelle. This membrane is often continuous with the plasma membrane of the cell.
* **Lumen:** The internal space enclosed by the membrane. The lumen may contain various molecules, such as proteins, enzymes, and substrates, depending on the function of the organelle.
* **Proteins:** Embedded within the membrane and/or present in the lumen, proteins play a crucial role in the function of the organelle. For example, they may act as receptors, transporters, or enzymes.

Examples of extracellular membrane-bounded organelles include:

* **Endosomes:** Involved in the sorting and trafficking of internalized materials, such as proteins and lipids.
* **Lysosomes:** Contain enzymes that break down cellular debris and foreign materials.
* **Secretory vesicles:** Store and transport molecules that are destined for secretion outside of the cell.
* **Exosomes:** Small vesicles that are released from cells and can carry various molecules to other cells, playing a role in cell-cell communication.

These organelles are dynamic structures that are constantly being remodeled and re-formed to meet the changing needs of the cell. They play essential roles in various cellular processes, and their proper function is essential for maintaining cell health.'
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Proteins (2)

Compounds (12)