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If the radius of a vessel is halved, the resistance will increase by a factor of 16. This is because resistance is inversely proportional to the fourth power of the radius (R ∝ 1/r^4). Therefore, a decrease in radius leads to a significant increase in resistance.

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Factors that affect vascular resistance?

Vascular resistance is influenced by factors such as vessel radius, vessel length, blood viscosity, and vessel compliance. Changes in these factors can impact the resistance to blood flow in the vasculature, affecting blood pressure and overall circulatory function.


Which would have the greater effect on vascular resistance?

Vasoconstriction would have a greater effect on increasing vascular resistance compared to vasodilation. When blood vessels constrict, their diameter decreases, leading to increased resistance to blood flow. Conversely, vasodilation results in an expansion of blood vessel diameter, reducing resistance.


What three variables affect peripheral resistance to blood flow?

Resistance is determined by three properties: the lengthand cross-sectional area of a material, and its resistivity. Since resistivity is affected by temperature, you could say that temperature indirectly affects resistance.


What will be changes in pressure if the number of molecules are halved in a vessel?

The pressure will also halve in this case.The pressure will also halve in this case.The pressure will also halve in this case.The pressure will also halve in this case.


What is the effect that radius changes have on the laminar flow of a fluid?

Increasing the radius of a pipe where laminar flow occurs typically leads to a decrease in the flow velocity needed to maintain laminar flow. This is because the flow rate is proportional to the radius to the power of four in laminar flow conditions. As a result, larger radii usually allow for higher flow rates while still maintaining laminar flow.

Related Questions

Why would blood vessel radius have a larger effect on the body than vessel length?

Blood vessel radius has a larger effect on the body because changes in radius significantly impact blood flow resistance, which affects blood pressure regulation and delivery of oxygen and nutrients to tissues. Vessel length, on the other hand, has a smaller direct effect on blood flow resistance and overall cardiovascular function.


Factors that affect vascular resistance?

Vascular resistance is influenced by factors such as vessel radius, vessel length, blood viscosity, and vessel compliance. Changes in these factors can impact the resistance to blood flow in the vasculature, affecting blood pressure and overall circulatory function.


What factors influences resistance to blood flow in the arteries?

resistance occurs as the blood flows away from heart through the vessels in the peripheral systemic circulation a term known as peripheral resistance. Viscosity of the blood (thickness) ,vessel length (distance) and vessel diameter (blood vessel radius) are three factors


Which would have the greater effect on vascular resistance?

Vasoconstriction would have a greater effect on increasing vascular resistance compared to vasodilation. When blood vessels constrict, their diameter decreases, leading to increased resistance to blood flow. Conversely, vasodilation results in an expansion of blood vessel diameter, reducing resistance.


What three variables affect peripheral resistance to blood flow?

Resistance is determined by three properties: the lengthand cross-sectional area of a material, and its resistivity. Since resistivity is affected by temperature, you could say that temperature indirectly affects resistance.


What blood vessel regulates systemic resistance?

which blood vessel regulates systemic resistance?


How does viscosity affect peripheral resistance?

If you increase the total peripheral resistance then the arterial blood pressure will increase.


What will be changes in pressure if the number of molecules are halved in a vessel?

The pressure will also halve in this case.The pressure will also halve in this case.The pressure will also halve in this case.The pressure will also halve in this case.


What happened to the rate as the right vessel radius was increased?

As the right vessel radius increased, the rate of flow in the vessel also increased. This is because as the radius of a vessel increases, the cross-sectional area for fluid flow also increases, allowing more fluid to pass through per unit of time. This relationship is described by Poiseuille's law for laminar flow in a cylindrical vessel.


What is the effect that radius changes have on the laminar flow of a fluid?

Increasing the radius of a pipe where laminar flow occurs typically leads to a decrease in the flow velocity needed to maintain laminar flow. This is because the flow rate is proportional to the radius to the power of four in laminar flow conditions. As a result, larger radii usually allow for higher flow rates while still maintaining laminar flow.


What is the affect on blood flow on the radius vessels?

The relationship between blood flow through a vessel and the radius of the vessel can be expressed as BF=1/pi r4 (where pi is equal to 3.14.....). So a change in the radius of a vessel has a large effect on the blood flow through the vessel.


If the radius of an arteriole increases from 2 to 3 mm how does this affect resistance and blood flow?

Intuitively, it's easy to think of blood flow through the arteries in the same way that you think of the flow of water through pipes. Change the radius of the pipe, and you change how fast water flows to them. Likewise, if you change the radius of an arteriole, you change the rate that blood flows through it. The underlying reason behind these observations is the same. Flow (Q) is determined by a pressure gradient (ΔP) and the resistance to flow (R): Q = ΔP / R If you increase resistance, you decrease flow; likewise, decrease resistance and you increase flow. But what determines resistance? Poiseuille's law tells us that resistance (R) is inversely proportional to the fourth power of radius (r). So let's say we take a normal blood vessel and measure the resistance; let's call that resistance R1. Now if we double the vessel radius, what happens to the resistance? Poiseuille's law (see link to left) tells us that if we double the radius, our resistance goes down by a factor of 16. So R2 is one-sixteenth of R1. How does this affect blood flow? For that we go to our original equation that related flow, pressure gradient, and resistance. From that you can see that flow is inversely proportional to resistance. So if you halve resistance, then you double flow; likewise, if you take our example and reduce resistance to a factor of one-sixteenth, then flow increases by a factor of 16. The same principles and steps can be used to figure out what happens when you change the radius of an arteriole from 2 mm to 3 mm. Only this time you're not increasing radius by a factor of 2; you're increasing it by a factor of 3 / 2, or 1.5.