Subgroups each comprised of 25 subjects having matched hematocrits were also compared, and viscosity remained significantly higher in hypertensive subjects (p<0.05). Systolic blood viscosity was 8 to 10% higher in hypertensive patients compared with normotensive controls, and diastolic blood viscosity was 16 to 28% higher in hypertensive patients. The earliest study observed 49 normal subjects and 49 patients with untreated essential hypertension, showing a direct correlation between BP and blood viscosity among both normotensive and hypertensive subjects (p<0.001). Three important studies helped establish the relationship between blood pressure and blood viscosity. Since increased viscosity requires a higher BP to ensure the same circulating volume of blood, both the burden on the heart and the forces acting on the vessel wall are directly modulated by changes in blood viscosity. Consequently, blood viscosity has been established as a major determinant of the work of the heart and tissue perfusion. Because of the dependence of systemic arterial BP on cardiac output and TPR, if blood viscosity and TPR rise, systolic BP must then increase for cardiac output to be maintained. Conversely, when viscosity decreases, blood flow and perfusion will increase. The relationship between BP and viscosity is such that, given a constant systolic BP, if blood viscosity increases, then the total peripheral resistance (TPR) will necessarily increase, thereby reducing blood flow. The factors that primarily determine the work of the heart include systolic blood pressure (BP), blood viscosity, and the volume of blood the myocardium has to pump. Regulation of electrolyte balance or fluid balance by removing salts from tissues to kidneys.Increasing evidence supports the importance of hemodynamic forces that are directly related to the work of the heart as the primary triggering event of atherosclerosis and atherothrombosis. Maintain water balance in the cells by transporting excess water to kidneys and sweat glands. It helps to maintain proper and constant body pH through buffering action. Note: -Blood helps in regulation of body temperature by absorbing, releasing or distributing heat. So, the correct answer is 'Systolic blood pressure'. Transport hormones from their sources to target sites and also enzymes from exocrine glands to cells. They transport metabolic wastes and toxins from tissues to kidneys and sweat glands. They transport respiratory gases between lungs and tissues. It plays an important role in the transport of nutrients from stomach, intestine and liver to tissues. Blood viscosity is mainly determined by hematocrit levels, plasma viscosity, and the deformability and aggregation of red blood cells (RBCs).Īdditional Information: -Blood pressure (BP) is the pressure of circulating blood against the walls of blood vessels. Viscosity, a basal parameter in rheology, is a major determinant of the shear stress imparted by blood flow, and plays an important role in maintaining vascular homeostasis. Hence, blood viscosity is important in maintaining systolic blood pressure. Increased blood viscosity requires a higher systolic blood pressure to ensure the same circulating volume of blood. Increase in systolic blood pressure with increase in blood viscosity is required to maintain the cardiac output. Similarly, when blood viscosity decreases, blood flow is increased. ![]() When blood viscosity increases, blood flow is reduced. There is a relationship between blood pressure and blood viscosity. Viscosity of blood is the measure of thickness and stickiness of blood. The Viscosity of blood is important in maintaining systolic blood pressure. The viscosity of blood is important in maintaining maximum pressure during one heartbeat. Hint: If blood viscosity increases, then the total peripheral resistance (TPR) will necessarily increase, thereby reducing blood flow.
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