This is an audio version of the Wikipedia Article:
00:01:01 1 Physiology
00:03:44 1.1 Function
00:06:46 1.2 Biosynthesis
00:08:51 1.3 Regulation of cholesterol synthesis
00:11:35 1.4 Dietary sources
00:15:39 1.5 Plasma transport and regulation of absorption
00:20:55 1.6 Metabolism, recycling and excretion
00:23:36 1.7 Research
00:24:30 2 Clinical significance
00:24:40 2.1 Hypercholesterolemia
00:31:28 2.2 Hypocholesterolemia
00:33:19 2.3 Cholesterol testing
00:33:29 3 Interactive pathway map
00:34:08 4 Cholesteric liquid crystals
00:34:17 5 Stereoisomers
00:35:38 6 See also
00:35:48 7 Additional images
00:35:56 8 References
00:36:06 9 External links
Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago.
Learning by listening is a great way to:
– increases imagination and understanding
– improves your listening skills
– improves your own spoken accent
– learn while on the move
– reduce eye strain
Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone.
You can find other Wikipedia audio articles too at:
You can upload your own Wikipedia articles through:
“The only true wisdom is in knowing you know nothing.”
Cholesterol (from the Ancient Greek chole- (bile) and stereos (solid), followed by the chemical suffix -ol for an alcohol) is an organic molecule. It is a sterol (or modified steroid), a type of lipid molecule, and is biosynthesized by all animal cells, because it is an essential structural component of all animal cell membranes.
In addition to its importance for animal cell structure, cholesterol also serves as a precursor for the biosynthesis of steroid hormones, bile acid and vitamin D. Cholesterol is the principal sterol synthesized by all animals. In vertebrates, hepatic cells typically produce the greatest amounts. It is absent among prokaryotes (bacteria and archaea), although there are some exceptions, such as Mycoplasma, which require cholesterol for growth.François Poulletier de la Salle first identified cholesterol in solid form in gallstones in 1769. However, it was not until 1815 that chemist Michel Eugène Chevreul named the compound “cholesterine”.