Smooth endoplasmic reticulum



(cell biology)

(A part of) endoplasmic reticulum that is tubular in form (rather than sheet-like) and lacks ribosomes. Its functions include lipid synthesis, carbohydrate metabolism, calcium concentration, drug detoxification, and attachment of receptors on cell membrane proteins.


It is seen connected to the nuclear envelope, and consists of tubules and vesicles that branch forming a network to increase surface area for the action or storage of key enzymes. It contains the enzyme Glucose-6-phosphatase (which converts glucose-6-phosphate to glucose), a step in gluconeogenesis. A specialized form of SER (called sarcoplasmic reticulum) occurs in muscle cells where calcium ions are stored. It is also abundant in hepatocytes to process and detoxify lipophilic drugs.

Abbreviation: SER

Synonym: agranular endoplasmic reticulum.
Compare: rough endoplasmic reticulum.
See also: endoplasmic reticulum.

Please contribute to this project, if you have more information about this term feel free to edit this page

This page was last modified on 30 September 2008, at 06:18. This page has been accessed 344,959 times. 
What links here | Related changes | Permanent link