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Cholesterol

Biology  Chloroplasts  Chordata
04/16/2014

Cholesterol is a lipid found in the cell membranes of all tissues, and it is transported in the blood plasma of all animals. Cholesterol is also considered a sterol (a combination steroid and alcohol).


Cholesterol
Cholesterol is small molecule, one of the steroids. It is essential to life.

cholesterol
An amphipathic lipid containing the four-ring steroid structure with a hydroxyl group on one ring; a major component of many eukaryotic membranes and precursor of steroid hormones. (Figure 5-29) ...

Cholesterol
In animals, cholesterol is a major membrane lipid. It may be equal in amount to phospholipids.
It is similar to phospholipids in that it one end is hydrophilic, the other end is hydrophobic.

Cholesterol and steroids: Most mention of these two types of lipids in the news is usually negative.

cholesterol
(kol-ess-teh-rol)
A steroid that forms an essential component of animal cell membranes and acts as a precursor molecule for the synthesis of other biologically important steroids.
Chondrichthyes ...

cholesterol /kə-LEST-ə-rawl/ The most important sterol in animals. It is a product of the liver and is essential to the functionality of the lipid bilayers of animal cell membranes.

(8) Cholesterol (see also cholesterol)
(a) Cholesterol, a kind of steroid, is an amphipathic lipid that is found in lipid bilayers that serves as a temperature-stability buffer ...

Hampton RY: Cholesterol homeostasis: ESCAPe from the ER.
Davies JP, Chen FW, Ioannou YA: Transmembrane molecular pump activity of Niemann-Pick C1 protein. ...

cholesterol
The Biology Project > Cell Biology > Cell Membranes > Problem Set
The Biology Project
Department of Biochemistry and Molecular Biophysics
University of Arizona
May 2002
Revised: August 2004
Contact the Development Team ...

Cholesterol is also present in the membrane. It maintains the fluidity and increases the stability of the membrane. Without cholesterol the membrane would easily split apart.
Functions of a membrane it's:
Selectively permeable barrier.

Cholesterol synthesis
Lipogenesis, the production of triglycerides (fats).
A bulk of the lipoproteins are synthesized in the liver.

cholesterol - lipid molecule with a characteristic four-ringed steroid structure that is an important component of the plasma membranes of animal cells ...

cholesterol Steroid that is an integral part of cell membranes and a precursor to other steroidal compounds in animals.
cholinergic Type of nerve fiber that releases acetylcholine from axon terminal.

In contrast, cholesterol has a complex carbon-based ring structure, and a single hydrophilic -OH group â†'.
Molecules with both hydrophobic and hydrophilic groups are termed amphipathic.

9. Which of the following are found in the cell membrane?
a. cellulose
b. phospholipids
c. cholesterol
d. proteins ...

cholesterol
choline
chromatid
chromatin
chromosomal
chromosome 1 2 3 4 5 6 7 8 9 10 11 12
chromosomes 1 2 3 4
chronic
chrysoperla
ciat ...

>"bad" cholesterol) and decreases HDL ("good" cholesterol) thus
>increasing the risk of heart attack, still the # 1 cause of death in the
>U.S.
> The text also mentioned the protective effect in females of having ...

MRC/BHF Heart Protection Study of cholesterol-lowering with simvastatin in 5963 people with diabetes: a randomised placebo-controlled trial. Lancet 2003;361(9374):2005-16. PMID 12814710.

Cholesterol (← links)
Diabetes insipidus (← links)
Adulterant (← links)
Pickle (← links)
Ilosvay reagent (← links)
Persulphocyanogen (← links)
Myosin (← links)
Hungary (← links)
Wormleys test (← links)
Papyrine (← links) ...

Cell membranes also contain cholesterol in the phospholipid bilayer. In some membranes there are only a few cholesterol molecules, but in others there are as many cholesterols as phospholipids according to Audesirk & Audesirk.

Steroid molecules and if you ever see a name of a molecule and it has the syllable ster in it like cholesterol estrogen, testosterone, ...

The cell membranes found in animal cells contain a chemical called cholesterol. This chemical makes the membrane harder. Plant cells do not need cholesterol, because they have a cell wall, as a result, their cell membranes are softer.

an organic compound containing four fused carbon rings, for example, cholesterol, sex hormones, vitamin D, and adrenocortical hormone (ACTH)
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
...

Myelin a mixture of phospholipids and cholesterol which forms a sheath around many nerve cells
Myofibrils the microscopic fibres that make up the larger fibres of skeletal muscle
Myoglobin an iron-containing protein found in muscle ...

Because they do that job, you would expect liver cells to have more peroxisomes than most other cells in a human body. They also play a role in cholesterol synthesis and the digestion of amino acids.

And there are different types of plasma membranes in different types of cells, and the plasma membrane has in it in general a lot of cholesterol as its lipid component. That's different from certain other membranes from within the cell.

See also: See also: Cells, Trans, Blood, Protein, Human

Biology  Chloroplasts  Chordata
04/16/2014

 
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