Endomembrane system

Endomembrane System

The Endomembrane System (/ˌɛndoʊˈmɛmbreɪn ˈsɪstəm/; from the Greek endo, meaning "inside" and membrane, meaning "skin") is a complex and dynamic network of membrane-bounded organelles found within eukaryotic cells.

Etymology

The term "Endomembrane System" is derived from the Greek words endo, meaning "inside", and membrane, meaning "skin". It refers to the system of internal membranes within a cell.

Function

The Endomembrane System plays a crucial role in various cellular processes, including protein synthesis, lipid metabolism, and the transport of cellular materials. It is composed of different components, each with a specific function.

Components

Nuclear Envelope: This double membrane surrounds the nucleus and separates it from the cytoplasm. It is continuous with the Endoplasmic Reticulum.

Endoplasmic Reticulum (ER): This network of membranous tubules and sacs plays a key role in protein synthesis and lipid metabolism. It is divided into two types: Rough ER, which has ribosomes attached to its surface, and Smooth ER, which lacks ribosomes.

Golgi Apparatus: This organelle modifies, sorts, and packages proteins and lipids for transport to their final destinations.

Vesicles: These small, membrane-bound sacs transport materials within the cell. They include lysosomes, which contain digestive enzymes, and peroxisomes, which are involved in lipid metabolism and detoxification processes.

Vacuoles: These large, membrane-bound sacs store materials such as water, nutrients, and waste products.

Related Terms

External links

Medical encyclopedia article on Endomembrane system
Wikipedia's article - Endomembrane system

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Endomembrane system