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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What is blood pressure? This is called systolic pressure. When the heart is at rest, between beats, your blood pressure falls. This is the diastolic pressure. Blood pressure - Wikipedia, the free encyclopedia When blood flow is nil (cuff pressure exceeding systolic pressure) or unimpeded (cuff pressure below diastolic pressure), cuff pressure will be essentially What Are High Blood Pressure and Prehypertension? Diastolic pressure does not need to be high for you to have high blood pressure. The higher the diastolic blood pressure the greater the risk for heart High blood pressure (hypertension) - causes, treatments and An elevation of the systolic and/or diastolic blood pressure increases the risk of developing heart (cardiac) disease, kidney (renal) disease, hardening of Low Blood Pressure (Hypotension) Causes, Symptoms, Diagnosis, and By convention, an individual's blood pressure is expressed as systolic/diastolic blood pressure, for example, 120/80.The systolic blood pressure (the top High blood pressure (hypertension) The second figure is the diastolic blood pressure. This is the minimum pressure in the arteries between beats when the heart relaxes to fill with blood. Blood pressure measurement Both the systolic and diastolic pressure measurements are important - if either one is raised, it means you have high blood pressure (hypertension). Systolic -- Not Diastolic -- Blood-Pressure Reading Should Define Systolic blood pressure, the first -- or higher -- number in a blood-pressure reading, is the important factor in determining whether a person has How To Lower Diastolic Blood Pressure, Safely? One of the most important numbers in determining blood pressure reading is the diastolic blood pressure. The diastolic blood pressure is the number at the Definition: diastolic blood pressure from Online Medical Dictionary diastolic blood pressure. The pressure exerted on the walls of the arteries when the heart is in the relaxation phase (diastole). High Blood Pressure (Hypertension) - Patient UK For example, it is estimated that reducing a high diastolic blood pressure by 6 mmHg reduces your relative risk of having a stroke in the future by about MedlinePlus Medical Encyclopedia: Blood pressure The bottom number is the diastolic blood pressure reading. It represents the pressure in the arteries when the heart is at rest. The Diastolic Blood Pressure in Systolic Hypertension diastolic blood pressure due to decreased aortic distensibility. 2. Increased pulse wave velocity (PWV) as a result of decreased aortic distensibility. 3. Medindia.net - Blood Pressure charts Mild Hypertension: The systollic blood pressure ranges between 140 and 160 and the diastolic blood pressure ranges between 90 and 100. What is diastolic pressure? Find the definition for diastolic the intracardiac pressure during or resulting from diastolic relaxation of a cardiac chamber; the lowest arterial blood pressure reached during any given Translating Blood Pressure Numbers Normal blood pressure is thus usually said to be 120/80 (systolic/diastolic) or less, measured in millimeters of mercury (abbreviated as mm Hg). Blood Pressure Hypertension Systolic Diastolic Information about a study that finds blood pressure numbers too high for many. High Blood Pressure High blood pressure, or hypertension, is defined in an adult as a systolic pressure of 140 mm Hg or higher and/or a diastolic pressure of 90 mm Hg or higher Measuring Blood Pressure, what the numbers mean. In a single day your blood pressure may vary by 30 to 40 mmHg systolic with similar proportionate changes in diastolic pressure. |
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