The resistance encountered by blood as it flows through the blood vessels is called blood flow resistance. As blood flows, it consumes energy due to friction, which is generally expressed as heat energy. This thermal energy cannot be converted into potential or kinetic energy of the blood, so the pressure of the blood gradually decreases as it flows through the blood vessels. In the case of turbulent flow, each mass in the blood constantly changes the direction of flow, so the energy consumed is more than in laminar flow, and the resistance to blood flow is greater. The increase in resistance to blood flow is mainly influenced by the viscosity of the blood. From the Poiseuille law can be seen, blood flow resistance and blood viscosity is directly proportional. Any factor that increases blood viscosity may increase peripheral resistance, increase blood pressure, and increase the burden on the heart. Blood pressure can be reduced by taking appropriate medications and foods that lower blood pressure. Blood lipid stasis and increased blood viscosity lead to smaller inner diameter of blood vessels and increased resistance! The resistance encountered when fluid flows through the blood vessels is called blood flow resistance. Blood flow resistance is caused by the consumption of energy due to friction during blood flow, which is generally expressed as heat energy. This thermal energy cannot be converted into potential or kinetic energy of the blood, so the pressure of the blood gradually decreases as it flows through the blood vessels. In the case of turbulent flow, each mass in the blood constantly changes the direction of flow, so the energy consumed is more than in laminar flow, and the resistance to blood flow is higher. The diagnosis is made by blood rheology examination. The resistance to blood flow is proportional to the length of the vessel and the viscosity of the blood, and inversely proportional to the fourth power of the radius of the vessel. Since the length of a vessel varies very little, the resistance to blood flow is determined primarily by the caliber of the vessel and the viscosity of the blood. For an organ, if the blood viscosity is constant, the blood flow to the organ depends primarily on the caliber of the resistance vessel in that organ. When the caliber of the resistance vessel increases, the resistance to blood flow decreases and blood flow increases, and conversely, when the caliber of the resistance vessel decreases, the blood flow to the organ decreases. Blood rheology is the science of blood flow and denaturation in blood vessels, of which blood viscosity is an important indicator to study. The level of plasma viscosity is determined by the amount of lipids (e.g. cholesterol, triglycerides, lipoproteins) and a large number of molecules of lipoproteins (e.g. fibrin, albumin, globulin) it contains. Lipids are one of the factors that make up the viscosity of blood. However, blood viscosity is mainly related to the number, size, aggregation and deformability of red blood cells and the amount of fibrinogen, lipids, globulins and albumin in the plasma. Erythrocyte pressure volume: It refers to the percentage of red blood cells to the whole blood volume. It reflects the ratio of red blood cells to plasma.