What is Cholesterol?

Cholesterol is a sterol (a combination steroid and alcohol). Cholesterol is a lipid found in the cell membranes of all tissues, and it is transported in the blood plasma of all animals. Because cholesterol is synthesized by all eukaryotes, trace amounts of cholesterol are also found in membranes of plants and fungi.The name originates from the Greek chole- (bile) and stereos (solid), and the chemical suffix -ol for an alcohol, as researchers first identified cholesterol in solid form in gallstones by Francois Poulletier de la Salle in 1769. However, it is only in 1815 that chemist Eugene Chevreul named the compound "cholesterine".[2]Most of the cholesterol is synthesized by the body and some has dietary origin. Cholesterol is more abundant in tissues which either synthesize more or have more abundant densely-packed membranes, for example, the liver, spinal cord 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 system 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.According to the lipid hypothesis, abnormally high cholesterol levels (hypercholesterolemia) and abnormal proportions of LDL and HDL are associated with cardiovascular disease by promoting atheroma development in arteries (atherosclerosis). This disease process leads to myocardial infarction (heart attack), stroke and peripheral vascular disease. As high LDL contributes to this process, it is termed "bad cholesterol", while high levels of HDL ("good cholesterol") offer a degree of protection. The balance can be redressed with exercise, a healthy diet, and sometimes medication.

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Blood Pressure Explained. Question ID : 307 There is no Á˜idealÁ™ blood pressure reading. The following figures for clinic blood pressures can be used as

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In this sense, they do not actually measure the blood pressure, but derive the readings. Digital oscillometric monitors are also confronted with Áœspecial

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Someone is considered to have high blood pressure symptoms when the pressure reading is 140/90 or higher. A typical, healthy reading is 120/80.

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Magnesium's impact on blood pressure explained New research published this week could help scientists to explain the role of magnesium in regulating blood

What do the numbers mean? - Blood pressure (BP) readings explained
What your blood pressure (BP) reading numbers mean.

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The following situations may cause substantial variations in blood pressure readings and should therefore be avoided at least 30 minutes prior to taking

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Blood Pressure Explained: Why record and chart high blood pressure? Your blood pressure changes throughout the day. Taking a single blood pressure reading

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High Blood Pressure, Explained! The measurement that the doctor takes at the office to determine our Blood Pressure (BP) is due to the recurrent pumping of

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What this usually means is that they have high blood pressure (hypertension), which is detrimental to their health. For adults, a normal reading can be

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Blood pressure explained. Blood pressure is the pressure of the blood in the There is no Á˜idealÁ™ blood pressure reading. The following figures for

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High blood pressure has a reading of 140/90 or above. The blood pressure reading is explained as: The first number is called the "systolic blood pressure"

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High Blood Pressure Explained Enlarge Image. What is High Blood Pressure? However, a blood pressure reading above 140/90 indicates hypertension and is

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Blood Pressure Explained. Blood pressure is the force of blood against the walls of arteries. Blood pressure is recorded as two numbersÁ”the systolic

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