# Describe the relationship between viscosity and blood flow

Viscosity of blood that is much more viscous than water? blood w/ a viscosity of peripheral resistance. What is the relationship between fluid flow is viscosity?. Explain why the relationship between viscosity and blood flow rate is inversely proportional. Viscosity is the thickness of blood. Thickness of blood can increase . The relationship between BP and viscosity is such that, given a constant systolic Conversely, when viscosity decreases, blood flow and perfusion will increase.

Am J Hypertens ; Viscosityhyperglycemiacirculatory loadblood pressuretemperature The aim of our study is to research the relationships among temperature, glucose concentration, and viscosity of blood and plasma, and to calculate their effects on blood pressure BP according to Hagen-Poiseuille's hydrodynamics equation.

### The Relationship Between Blood Pressure and Blood Viscosity | Meridian Valley Lab

If the human circulatory system is considered as a closed system, hemodynamic equilibrium can be determined according to Poiseuille's equation through the pressure, viscosity, flow rate, velocity of blood, and vessel diameter.

Viscosity can be defined as the resistance of fluids against flow. The resistance for blood circulation includes friction between the blood elements and between the vessel lumen and blood.

To make a fluid flow, the application of energy is required. Therefore, the energy of the circulatory system is spent in correlation with the viscosity level of blood. Energy forms of the circulatory system are BP and blood flow velocity. It has been shown that between In this state, according to Poiseuille's equation, blood flow rate decreases by Because atherosclerotic vessels cannot dilate sufficiently as a response to vasodilator drugs, it has been suggested that increased blood viscosity can only be compensated with a BP increase in such circumstances.

For the first group, our aim was to measure the possible alterations in blood and plasma viscosity and erythrocyte deformability due to temperature changes on healthy subjects, and also to determine the changes of BP by using calculations based upon the law of hemodynamics.

As diameters of erythrocytes are larger than those of capillaries, they can only pass through capillaries by deforming. Such a shape alteration capacity of erythrocytes can be measured and defined with the concept of deformability. The free flow time of erythrocyte mass through the viscometer is inversely proportional to erythrocyte deformability. The second group consisted of diabetes mellitus DM type II patients without diabetic complications.

Our aim was to determine the relationship between blood glucose and viscosity during an oral glucose tolerance test OGTTand to calculate the effects of these factors on BP with the law of hydrodynamics. Diabetic patients were chosen to research the relationship between glucose and viscosity in a wide range of blood glucose concentrations.

Water behaves as a Newtonian fluid and therefore under non-turbulent conditions, its viscosity is independent of flow velocity i. This is shown in the figure as a linear dashed line for the flow-pressure relationship of water. There is an inverse relationship between flow and viscosity; therefore, the greater the viscosity the smaller the slope of the flow-pressure relationship, meaning that at a given driving pressure flow will be reduced at higher viscosities.

Whole blood has a much higher viscosity than water and therefore the slope of the flow-pressure relationship is less steep see figure. Unlike water, blood is non-Newtonian because its viscosity increases at low flow velocities e.

This can cause red cells to stick together and form chains of several cells rouleau formation within the microcirculation, which increases the blood viscosity. Because of the high degree of interaction between the elements of blood when it is not flowing, a driving pressure significantly greater than zero is required for stationary blood to start flowing again. Although plasma is mostly water, it also contains other molecules such as electrolytes, proteins especially albumin and fibrinogenand other macromolecules.

Because of molecular interactions between these different components of plasma, it is not surprising that plasma has a higher viscosity than water. The addition of formed elements to plasma red cells, white cells, and platelets further increases the viscosity. Moreover, they wrote that the pathophysiological significance of blood viscosity in hypertension related to its modulation of TPR. The researchers grouped patients into three categories by their diastolic blood viscosity levels: Blood viscosity holds certain similarities with blood pressure.

## Viscosity of Blood

Like blood pressure, the viscosity of blood changes during each cardiac cycle and is reported using two numerical quantities: However, while blood pressure is parameter of the circulatory system as a whole, blood viscosity is a parameter specific to the fluid flowing through the system. Therefore, viscosity can be said to precede pressure and to be biophysically more fundamental than pressure.

The Blood Viscosity Test is not covered by insurance plans.