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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low blood pressure, high heart rate My mother, who is 74, has a blood pressure of 115/60 and a pulse rate of 90. Are these readings normal or do they indicate a weak heart or other problem? IngentaConnect Heart rate and blood pressure variability in normal Heart rate and blood pressure variability in normal subjects compared with data from beat-to-beat models developed from de Boer's model of the Blood pressure - Wikipedia, the free encyclopedia In the circulatory system, this rate is called heart rate, the rate at which . Medicine : The Normal Difference in Bilateral Indirect Blood Pressure heart rate and blood pressure variability The combination of reflexes are often called the exercise pressor reflex since they produce an increase in blood pressure and also in heart rate. Normal Blood Pressure Rate in Children - What is the normal blood Normal Blood Pressure and Heart Rate in Children It is good to be asking about normal blood pressure values for children because most people think Blood Pressure Normal systolic blood pressure in an adult varies between 110 and 140 mm Hg, The resting heart rate for the average person is between 70 and 90 beats Heart Rate and Blood Pressure Heart Rate Lab: What is the Pulse? A normal heart receives oxygenated blood, denoted in red (right), entering via the left and right pulmonary veins. How the Body Controls Blood Pressure On the other hand, if blood pressure suddenly drops, a series of changes restores normal blood pressure. These include short-term increases in heart rate, Low blood pressure Until recently, normal blood pressure was considered to be the average and then have your blood pressure and heart rate measured whilst the table tilts LifeHeart.com | Blood Pressure New guidelines set a target "normal" blood pressure at less than 120 (systolic)/less than 80 (diastolic) mm Hg. A normal resting adult heart rate is Vital Signs (Body Temperature, Pulse Rate, Respiration Rate, Blood The normal body temperature of a person varies depending on gender, Electronic blood pressure monitors may also measure the heart rate, or pulse. |
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