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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Postexercise Systolic Blood Pressure Response: Clinical The three-minute systolic blood pressure ratio, another important indicator of significant coronary artery disease, is a useful and readily obtainable Is your systolic blood pressure too high? Systolic blood pressure measurement â“ Information on blood pressure treatment. systolic blood pressure (physiology) -- Britannica Online Encyclopedia In human beings, blood pressure is usually measured indirectly over the brachial or femoral artery: the highest (systolic) pressure, normally about 120 (100 High blood pressure (hypertension) - causes, treatments and The top number, the systolic blood pressure, corresponds to the pressure in An elevation of the systolic and/or diastolic blood pressure increases the National High Blood Pressure Education Month Blood pressure is typically recorded as two numbers â” the systolic pressure (as the For most Americans, systolic blood pressure increases with age, What Are High Blood Pressure and Prehypertension? Systolic pressure is the force of blood in the arteries as the heart beats. For most Americans, systolic blood pressure increases with age, Blood Pressure, Hypertension and Systolic Hypertension Optimal blood pressure is 120/80 or less. Borderline systolic blood pressure is 130-139 with high systolic blood pressure defined as 140 or higher. systolic+blood+pressure - Definition from Merriam-Webster's Definition of systolic+blood+pressure from Merriam-Webster's Medical Dictionary with examples and pronunciations. Blood pressure measurement The systolic pressure is the maximum pressure in an artery at the moment when the heart is beating and pumping blood through the body. Systolic definition - Medical Dictionary definitions of popular Systolic: The blood pressure when the heart is contracting. In a blood pressure reading, the systolic pressure is typically the first number recorded. Measuring Blood Pressure, what the numbers mean. The top number, which is called the systolic pressure, shows the pressure in your arteries when your heart is forcing blood through them. Treating Systolic High Blood Pressure In Older Persons Is Beneficial Treatment to lower systolic high blood pressure in older persons is associated with substantial reduction of stroke and other cardiovascular diseases, Systolic blood pressure -- Basile 325 (7370): 917 -- BMJ Elevation of systolic blood pressure predicts the risk of cardiovascular disease better than increases in diastolic blood pressure.1 Although this was Hypertension - Wikipedia, the free encyclopedia Hypertension is considered to be present when a person's systolic blood pressure is consistently 140 mmHg or greater, and/or their diastolic blood pressure Blood pressure - Wikipedia, the free encyclopedia The pressure at which this sound is first heard is the systolic blood pressure. The cuff pressure is further released until no sound can be heard (fifth High Blood Pressure - Systolic High Blood Pressure - Hypertension Questions and answers about systolic high blood pressure. What is blood pressure? Your blood pressure is at its highest when the heart beats, pumping the blood. This is called systolic pressure. When the heart is at rest, between beats, MedlinePlus Medical Encyclopedia: Blood pressure The top number is the systolic blood pressure reading. It represents the maximum pressure exerted when the heart contracts. Clinical Advisory: NHLBI Issues New Clinical Advisory on Systolic But we now know that, as people get older, systolic blood pressure The advisory recommends reducing systolic blood pressure to less than 140 mm Hg. |
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