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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High Blood Pressure - Things you can do to help lower yours
Ask Your Family Doctor Developed by the College of Family Physicians of Canada What is high blood pressure? Imagine that your arteries are pipes that carry

Natural Remedies for High Blood Pressure
Learn about natural remedies for high blood pressure, such as herbs, diet, nutrition, chinese medicine, ayurvedic remedies, supplements, and home remedies.

High blood pressure (hypertension)
The heart is a pump designed to force blood through our body. Blood is pumped from the heart through the arteries out to our muscles and organs.

NIHSeniorHealth: High Blood Pressure - Table of contents
High Blood Pressure. Table of Contents. What Is High Blood Pressure? Risk Factors and Prevention · Symptoms and Diagnosis · Treating High Blood Pressure

Blood pressure (high) Introduction - Health encyclopaedia - NHS Direct
Persistent high blood pressure (hypertension), if untreated puts you at greater risk of having a heart attack (myocardial infarction) or stroke.

Hypertension - Wikipedia, the free encyclopedia
Hypertension, commonly referred to as "high blood pressure" or HTN, Secondary hypertension indicates that the high blood pressure is a result of (i.e.

High Blood Pressure (Hypertension) - Patient UK
Having high blood pressure is one of several 'risk factors' that can increase your chance of developing heart disease, a stroke, and other serious

High blood pressure (hypertension) - MayoClinic.com
High blood pressure â” Comprehensive overview covers symptoms, treatment and prevention of hypertension.

High Blood Pressure Center - MayoClinic.com
High Blood Pressure Center â” medications, low-sodium diet, other strategies to lower blood pressure.

WebMD Hypertension/High Blood Pressure Center - Find high blood
High blood pressure affects I in 4 American adults. Find in-depth high blood pressure and hypertension information including its causes, symptoms,

High Blood Pressure (Hypertension)
It might seem odd that kids can have high blood pressure, or hypertension, because we usually associate the condition with older people.

High blood pressure (hypertension) - causes, treatments and
High Blood Pressure: Medical information about hypertension, its treatment, therapies and prevention.

Publications
You can have high blood pressure, or hypertension, and still feel just fine. More than half of Americans over age 60 have high blood pressure.

High Blood Pressure: Things You Can Do to Help Lower Yours
Information about lowering your blood pressure from the American Academy of Family Physicians.

What Is High Blood Pressure?
High blood pressure is a blood pressure reading of 140/90 mmHg or higher.

High Blood Pressure
Many people have high blood pressure for years without knowing it. Uncontrolled high blood pressure can lead to stroke, heart attack, congestive heart

High Blood Pressure (Hypertension) - Symptoms, Causes, Diagnosis
Consumer health resource center providing an overview of hypertension and its causes, symptoms and treatment.

Your Guide to Lowering High Blood Pressure, NHLBI
This site, for people who want to learn about preventing and controlling high blood pressure. Based clinical guidelines and research studies,

MedlinePlus: High Blood Pressure
High blood pressure usually has no symptoms, but it can cause serious problems such as stroke, heart failure, heart attack and kidney failure.


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