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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FOXNews.com - Study: Hormone in Human Urine May Lower Blood
Study: Hormone in Human Urine May Lower Blood Pressure, Sodium Levels, Researchers at Cornell University and the Boyce Thompson Institute for Plant Research

Sodium and Health
Human blood contains 0.9% salt (sodium chloride) -- the same concentration as Reducing blood pressure can reduce the risk of a heart attack or stroke

SODIUM STATUS, CORTICOSTEROID METABOLISM AND BLOOD PRESSURE IN
AND BLOOD PRESSURE IN NORMAL HUMAN SUBJECTS AND. IN A PATIENT WITH ABNORMAL SALT APPETITE. Mary C Ingram, A Michael Wallace,* Andrew Collier, Robert Fraser

Regional cerebral blood flow in normal pressure hydrocephalus
Key words: Normal pressure hydrocephalus - Single-. photon emission tomography - Regional cerebral blood. flow - Hexamethylpropylene amine oxime

Lactotripeptides Show No Effect on Human Blood Pressure. Results
Lactotripeptides Show No Effect on Human Blood Pressure. Results From a Double-Blind Randomized Controlled Trial. Mariëlle F. Engberink*; Evert G. Schouten;

High Blood Pressure and Kidney Disease
Your blood pressure is considered normal if it stays below 120/80 (expressed . Institutes of Health of the U.S. Department of Health and Human Services.

High Blood Pressure
High blood pressure is an extremely important concern in human medicine. . normal blood pressure despite being surrounded by hospital staff.

Journal of Cerebral Blood Flow & Metabolism - Abstract of article
Changes in Cerebral Blood Flow During Cerebrospinal Fluid Pressure Manipulation in Patients With Normal Pressure Hydrocephalus: A Methodological Study

Howstuffworks "How Blood Works"
The adult human body contains approximately 5 liters (5.3 quarts) of blood; Omron offers an easy and convenient way to monitor your blood pressure with

Blood pressure measurement
The information is recorded on a chip in the device and allows the doctor to get a detailed picture of blood pressure variation in a normal environment.

Initial Evaluation of Blood Pressure
The commonly used ABPM normal values for daytime blood pressure are <135/85, . Perloff D, Grim C, Flack J, et al., Human blood pressure determination by

Healthy Hearts: Hypertension/High Blood Pressure - The Human Heart
However, there is a range of "normal" blood pressure readings. You are viewing a page in The Franklin Institute's online exploration of the human heart.

Blood Pressure Chart - Normal Blood Pressure Range
Normal human daily Blood Pressure Range can vary widely, so any single blood pressure monitor reading is not reliable. BP monitor readings must be taken at

The Human Circulatory System II
This reduces the volume of the system and helps maintain normal blood pressure. Air-breathing vertebrates that spend long periods under water (e.g., seals,

Aspects of Individual Human Blood Pressure
Aspects of Individual Human Blood Pressure Ora Newman Fulton Elementary School 2045 E. Average, or normal pressure is 120/80. Chart the class by teams,

Blood pressure - Wikipedia, the free encyclopedia
ScienceDirect - The American Journal of Emergency Medicine : The Normal Difference in Bilateral Indirect Blood Pressure Recordings in Normotensive

Pressure in the Human Circulatory System
Pressure in the Human Circulatory System. The Physics Factbook™ For adults normal blood pressure is less than 19 kPa systolic, and 12 kPa diastolic.

What Is High Blood Pressure?
U.S. Department of Health & Human Services * National Institutes of Health A blood pressure reading below 120/80 mmHg is considered normal.


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