Table of Contents
How does blood viscosity affect blood flow?
Blood viscosity is an important determinant of local flow characteristics, which exhibits shear thinning behavior: it decreases exponentially with increasing shear rates. Both hematocrit and plasma viscosity influence blood viscosity.
Does iron increase blood viscosity?
Data showing that iron deficiency and microcytosis increase whole blood viscosity are inconsistent.
Is anemic blood less viscous?
Results: Viscosity did not differ between patients with iron deficiency (n = 14) and those without (n = 25). Whole blood viscosity correlated with Hct (r = 0.63, p < 0.001 at low shear and r = 0.84, p < 0.001 at high shear) but not with red blood cell size or iron indices.
What are the three fluid pressures that affect blood flow?
Blood pressure is measured with a sphygmomanometer and is recorded as the systolic pressure over the diastolic pressure. Four major factors interact to affect blood pressure: cardiac output, blood volume, peripheral resistance, and viscosity. When these factors increase, blood pressure also increases.
Does low blood viscosity increase circulation?
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. Conversely, when viscosity decreases, blood flow and perfusion will increase.
What effect would a decreased hematocrit have on blood flow?
What effect would a decreased hematocrit have on blood flow? You correctly answered: decreased viscosity, increased flow.
Why does viscosity decrease in anemia?
Some patients with anemia have low hematocrits, and therefore reduced blood viscosities. Another important factor that influences blood viscosity is temperature. Just like molasses, when blood gets cold, it becomes “thicker” and flows more slowly.
What factor is most likely to cause a faster rate of blood flow?
The narrowing of blood vessels increases pressure and leads to a faster blood flow. A. A high viscosity of blood causes an increased resistance in the blood vessels and leads to slow blood flow. Viscosity refers to the thickness of blood.
Which of the factors that affect blood flow increase blood pressure?
Blood pressure increases with increased cardiac output, peripheral vascular resistance, volume of blood, viscosity of blood and rigidity of vessel walls. Blood pressure decreases with decreased cardiac output, peripheral vascular resistance, volume of blood, viscosity of blood and elasticity of vessel walls.