Endomembrane system
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{{Endomembrane system diagram}}
The '''endomembrane system''' is the system of internal [[biological membrane|membrane]]s within [[eukaryote|eukaryotic cells]] that divide the [[cell (biology)|cell]] into functional and structural compartments, or [[organelle]]s. [[Prokaryote]]s do not have an endomembrane system and thus lack most organelles.
The endomembrane system also provides a transport system, for moving molecules through the interior of the cell, as well as interactive surfaces for [[lipid]] and [[protein]] synthesis. The membranes that make up the endomembrane system are made of a lipid bilayer, with proteins attached to either side or traversing them.
The following organelles are part of the endomembrane system:
*The [[cell membrane]] is a phospholipid bilayer membrane that separates the cell from its environment and regulates the transport of molecules and signals into and out of the cell.
*The [[nuclear envelope]] is the membrane around the [[cell nucleus|nucleus]] of the cell. The nucleus itself is not part of the Endomembrane system.
*The [[endoplasmic reticulum]] is a synthesis and transport organelle that is an extension of the nuclear envelope.
*The [[Golgi apparatus]] acts as the packaging and delivery system for molecules.
*[[Lysosome]]s are the "digestive" units of the cell. They utilize [[enzyme]]s to break down macromolecules and also act as a waste disposal system.
*[[Vacuole]]s act as storage units in some cells. ''(Vacuoles do not communicate with the organelles of the endomembrane system and therefore are sometimes not considered part of it.)''
*[[Vesicle (biology)|Vesicle]]s are small membrane-enclosed transport units that can transfer molecules between different compartments.
[[Category:Cell anatomy]]
[[Category:Membrane biology]]
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