The name originates from the Greek chole- (bile) and stereos (sound), and the chemical suffix -ol for an alcohol, as researchers first identified cholesterol in rich form in gallstones by Francois Poulletier de la Salle in 1769. However, it is only in 1815 that chemist Eugene Chevreul named the come to terms 'cholesterine'.

Most of the cholesterol in the body is synthesized by the body and some has dietary origin. Cholesterol is more thick in tissues that either synthesize more or be in possession of more abundant densely-packed membranes, because example, the liver, spinal small rope and brain. It plays a central role in many biochemical processes, such as the composition of cell membranes and the synthesis of steroid hormones. Cholesterol is insoluble in blood, but is transported in the circulatory plan bound to one of the varieties of lipoprotein, spherical particles which have an exterior composed mainly of water-soluble proteins. The main types, low-density lipoprotein (LDL) and high-density lipoprotein (HDL) carry cholesterol from and to the liver, respectively.

According to the lipid hypothesis, abnormally high cholesterol levels (hypercholesterolemia) and abnormal proportions of LDL and HDL are associated with cardiovascular disease by means of promoting atheroma development in arteries (atherosclerosis). This disease process leads to myocardial infarction (heart attack), stroke and peripheral vascular disease. As eminent LDL contributes to this process, it is termed 'bad cholesterol', while high levels of HDL ('good cholesterol') offer a degree of protection. The overplus be able to be redressed with exercise, a healthy diet, and at a past period medication.

Function

Cholesterol is required to build and maintain cell membranes; it regulates membrane fluidity over a wide range of temperatures. The hydroxyl group on cholesterol interacts with the phosphate head of the membrane, while the massive steroid and the hydrocarbon manacle is embedded in the membrane. Some research indicates that cholesterol may act as every antioxidant. Cholesterol also aids in the manufacture of bile (which is stored in the gallbladder and helps digest fats), and is also important for the metabolism of fruitful soluble vitamins, including vitamins A, D, E and K. It is the major forerunner for the synthesis of vitamin D and of the various steroid hormones (which include cortisol and aldosterone in the adrenal glands, and the sex hormones progesterone, the various estrogens, testosterone, and derivatives).