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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MedlinePlus: High Blood Pressure 120/80 or lower is normal blood pressure; 140/90 or higher is high blood pressure; 120 and 139 for the top number, or between 80 and 89 for the bottom Go Ask Alice!: Blood Pressure Numbers Alice, What does a large split in blood pressure numbers mean? check out past "Go Ask Alice" questions Hypertension and Normal blood pressure. The Healthy Heart kit Blood pressure is normal when the higher number is below 130 and the lower number is below 85. For example, 125 over 80 (125/80) is normal blood pressure. Translating Blood Pressure Numbers It is crucial to ÁœKnow Your NumbersÁ« with respect to Blood Pressure. Normal blood pressure is thus usually said to be 120/80 (systolic/diastolic) or How Is Blood Pressure Measured? Depending on your age, your top blood pressure number can be a stronger Medical guidelines state that a normal blood pressure for most adults is less What do the numbers mean in a blood pressure reading? According to high blood pressure guidelines from the American Heart Association (AHA), numbers under 140/90 and over 90/60 are generally considered normal Measuring Blood Pressure, what the numbers mean. Even if your blood pressure is 'normal', ie, below 140/90mmHg, it is still important to know your numbers, so that you can keep track of your blood pressure About High Blood Pressure Normal blood pressure falls within a range; it's not one set of numbers. When the heart beats, it pumps blood to the arteries and creates pressure in them. What is blood pressure? (Bottom number). Normal, Less than 120, Less than 80. Prehypertension, 120-139, 80-89. High Blood Pressure, Systolic, Diastolic. Stage 1, 140-159, 90-99 What Is High Blood Pressure? Normal blood pressure is lower than 120/80 mmHg. Prehypertension is blood pressure between 120 and 139 for the top number, or between 80 and 89 for the Blood Pressure Chart - Normal Blood Pressure Range What is Normal Blood Pressure? Buy and use a blood pressure monitor. Compare your BP reading with the numbers on the chart above. |
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