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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Pressure-Equalizing Ear Tubes Pressure-Equalizing Ear Tubes: Provides comprehensive information concerning causes, Blood pressure is taken by wrapping a cuff around the arm. Evaluation of a Direct Blood Pressure Measurement Technique for Repeated direct puncture of the central ear (intermediate auricular) artery to obtain mean arterial blood pressure in control and hypertensive dogs was BBC - Health - Conditions - Dizziness Other problems with the inner ear that can cause dizziness include Meniere's If your normal blood pressure tends to be low, you're more likely to suffer InteliHealth: When blood pressure is very high, it can cause symptoms such as headaches, dizziness, fatigue and ringing in the ears. However, it often causes no symptoms. Valsalva maneuver - Wikipedia, the free encyclopedia The output of the heart is reduced; the blood pressure falls. when used as a tool to equalize middle ear pressure, carries with it the risk of auditory The effect of blood pressure on inner ear blood flow. We investigated the effects of blood pressure on the blood flow in the inner ear as compared with other organs in normotensive rats (NR), GUSHING SOUND IN EARS? she's had high blood pressure for many years and has also been taking medication for that. Since her CHF, she gets this loud gishing sound in her ears at Ears and Altitude When that occurs, the middle ear pressure cannot be equalized. high blood pressure, irregular heart rhythms, thyroid disease, or excessive nervousness. Plugged Ears: Little Known Causes High blood pressure. We've noticed our ears get plugged from eating certain foods and supplements that are known to increase blood pressure. MedlinePlus Medical Encyclopedia: Tinnitus Ringing in the ears; Noises or buzzing in the ears; Ear buzzing Occasionally, it is a sign of high blood pressure, an allergy, or anemia. Tinnitus - CNN.com That causes blood flow to become more forceful and sometimes more turbulent, making it easier for your ear to detect the beats. High blood pressure. |
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