Everything about The Endomembrane System totally explained
The
endomembrane system is the system of internal
membranes within
eukaryotic cells that divide the
cell into functional and structural compartments, or
organelles.
Prokaryotes don't 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 nucleus of the cell. The nucleus itself isn't part of the Endomembrane system.
- The endoplasmic reticulum is a synthesis and transport organelle that's an extension of the nuclear envelope.
- The Golgi apparatus acts as the packaging and delivery system for molecules.
- Lysosomes are the "digestive" units of the cell. They utilize enzymes to break down macromolecules and also act as a waste disposal system.
- Vacuoles act as storage units in some cells. (Vacuoles don't communicate with the organelles of the endomembrane system and therefore are sometimes not considered part of it.)
- Vesicles are small membrane-enclosed transport units that can transfer molecules between different compartments.
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