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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ear pressure/ear pressure - how-to videos at SuTree.com tags: ear pressure, middle ear pressure, ears popping tags: heart attack, high blood pressure, hypertension, moreheart failure less Science Links Japan | RELATIONSHIP BETWEEN MIDDLE EAR MUCOSAL Title;RELATIONSHIP BETWEEN MIDDLE EAR MUCOSAL BLOOD FLOW DYNAMICS AND TOTAL MIDDLE EAR PRESSURE IN OTITIS MEDIA. Author;UTAHASHI HIROYA(Jikei Univ. Middle ear pressure change during controlled breathing with gas Middle ear pressure, rectal temperature, and vital signs were recorded throughout. The time constant for blood-middle ear N2O exchange was calculated from Middle ear pressure in patients with dizziness. The middle ear pressure difference might also be related to abnormal blood gas levels in patients with dizziness. Publication Types: Auris, Nasus, Larynx : The effect of respiratory mode on human The partial pressure of carbon dioxide in the venous blood (PvCO2) and the middle ear pressure were increased by hypoventilation, and decreased by 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. Cell Phones - Ear, Eye Damage, High Blood Pressure & More! - Share There is a worldwide crisis of people suffering from high blood pressure. Robert Riedlinger has put together three news stories which link this very serious Ears and Altitude When that occurs, the middle ear pressure cannot be equalized. If the tube remains blocked, fluid (like blood serum) will seep into the area from the Pressure-Equalizing Ear Tubes Pressure-Equalizing Ear Tubes: Provides comprehensive information concerning causes, Blood pressure is taken by wrapping a cuff around the arm. 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. 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 |
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