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Similarly, if the viscosity of the blood increases 2-fold, the resistance to flow will increase 2-fold. In contrast, an increase in diameter (or radius) reduces resistance. The change in diameter alters resistance to the fourth power of the change in diameter. For example, a 2-fold increase in diameter decreases resistance by 16-fold!
- Hemodynamics
For the flow of blood in a blood vessel, the ΔP is the...
- Viscosity
Viscosity of Blood. Viscosity is an intrinsic property of...
- Laminar Flow
Laminar flow is the normal condition for blood flow...
- Hemodynamics
Jul 30, 2022 · 6.3: Blood Flow, Blood Pressure, and Resistance. By the end of this section, you will be able to: Blood flow refers to the movement of blood through a vessel, tissue, or organ, and is usually expressed in terms of volume of blood per unit of time. It is initiated by the contraction of the ventricles of the heart.
As shown in Figure 20.2.1, the difference between the systolic pressure and the diastolic pressure is the pulse pressure. For example, an individual with a systolic blood pressure (BP) of 120 mm Hg and a diastolic BP of 80 mm Hg would have a pulse pressure of 40 mmHg. Pulse pressure = systolic BP – diastolic BP.
- Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat...
- 2019
Kinetic energy and pressure energy can be interconverted so that total energy remains unchanged. This is the basis of the Bernoulli principle. This principle can be illustrated by a blood vessel that is suddenly narrowed, then returned to its normal diameter. In the narrowed region (stenosis), the velocity increases as the diameter decreases.
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The task of maintaining an adequate interstitial homeostasis (the proper nutritional environment surrounding all cells in your body) requires that blood flows almost continuously through each of the millions of capillaries in the body. The following is a brief description of the parameters that govern flow through a given vessel. All bloods vessels...
This equation may be applied not only to a single vessel, but can also be used to describe flow through a network of vessels (i.e., the vascular bed of an organ or the even your entire systemic circulatory system). It is known that the resistance to flow through a cylindrical tube or vessel depends on several factors (described by Poiseuille) inclu...
If one combines the preceding two equations into one expression, which is commonly known as the Poiseuille equation, it can be used to better approximate the factors that influence flow though a cylindrical vessel:
Importantly, flow will only occur when a pressure difference exists. Hence, it is not surprising that arterial blood pressure is perhaps the most regulated cardiovascular variable in the human body, and this is principally accomplished by regulating the radii of vessels (e.g., arterioles and metarterioles) within a given tissue or organ system. Whe...
The volume of blood that flows through any tissue in a given period of time (normally expressed as mL/min) is called the local blood flow. The velocity (speed) of blood flow (expressed as cm/sec) can generally be considered to be inversely related to the vascular cross-sectional area, such that velocity is slowest where the total cross-sectional ar...
Dec 19, 2023 · There are two ways in which blood flows within our vessels. In most straight blood vessels, the flow is laminar. Velocity (rate of blood flow) is highest in the centre of the vessel and decreases closer to the vessel wall. This decreasing velocity gradient is due to increasing resistance closer to the vessel wall.
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Feb 24, 2023 · Cardiovascular System: Arteriosclerosis. Compliance allows an artery to expand when blood is pumped through it from the heart, and then to recoil after the surge has passed. This helps promote blood flow. In arteriosclerosis, compliance is reduced, and pressure and resistance within the vessel increase.
