This will lead to decreased oxygen delivery. When the hematocrit rises to 60 or 70, which it often does in polycythemia, the blood viscosity can become as great as 10 times that of water, and its flow through blood vessels is greatly retarded because of increased resistance to flow. The viscosity of blood after this shear rate is reached is about five times as great as the viscosity of water. Until this point is reached the term viscosity cannot be applied to blood. The fluid must reach a shear rate of about 100 to be assumed Newtonian. VISCOSITY Meaning in Urdu - Urdu Translation. However, plasma can be considered a Newtonian fluid, but blood cannot due to the red blood cells which add non-idealties to the fluid. viscosity translate in gujarati mean Web(1) Electronics also compensate for changes in oil viscosity for. The viscosity of blood thus depends on the viscosity of the plasma, in combination with the hematocrit. Physicians also may prescribe medicine for this conditions, including stroke, impotence, male infertility, Raynaud's disease, and nerve and circulation problems caused by diabetes.īlood is a liquid that consists of plasma and particles, such as the red blood cells. Viscous Blood can cause painful leg cramps or leg pain caused by poor circulation, a condition called intermittent claudication. Blood viscosity also increases with increases in red cell aggregability.įreebase Rate this definition: 5.0 / 1 voteīlood viscosity is a measure of the resistance of blood to flow, which is being deformed by either shear or extensional strain. Contrarily, blood viscosity increases when shear rate goes down with increased vessel diameters or with low flow, such as downstream from an obstruction or in diastole. Therefore, blood is a shear-thinning fluid. Blood becomes less viscous at high shear rates like those experienced with increased flow such as during exercise or in peak-systole. As such, the viscosity of blood varies with shear rate. Because of that, blood behaves as a non-Newtonian fluid. Red blood cells have unique mechanical behavior, which can be discussed under the terms erythrocyte deformability and erythrocyte aggregation. Blood viscosity is determined by plasma viscosity, hematocrit (volume fraction of red blood cell, which constitute 99.9% of the cellular elements) and mechanical properties of red blood cells. Alterations of these properties play significant roles in disease processes. Proper tissue perfusion can occur only when blood's rheological properties are within certain levels. Hemorheology, also spelled haemorheology (from Greek ‘αἷμα, haima 'blood' and rheology, from Greek ῥέω rhéō, 'flow' and -λoγία, -logia 'study of'), or blood rheology, is the study of flow properties of blood and its elements of plasma and cells. Wikipedia Rate this definition: 0.0 / 0 votes
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