Why do you think blood vessel radius can have a larger effect on the body than changes in blood vessel length use the blood flow equation?
Explain why you think blood vessel radius can have a larger effect on the body than changes in blood vessel length (use the blood flow equation). Your answer: Because blood vessel radius change allows for less ressistance which provides greater blood flow.
How does changing the radius affect blood flow?
Therefore, blood flow is strongly proportional to the vessel radius. As the radius of the vessel lumen increases (called vasodilation), blood flow increases dramatically, and vice versa (1).
What happens when blood vessel radius increases?
Increase in radius causes increase in blood flow rate.
What is the relationship between blood vessel length and blood flow rate directly proportional?
You correctly answered: Blood vessel length is directly proportional to resistance and inversely proportional to blood flow.
What is the relationship between a change in the radius of a vessel and the flow volume through that vessel?
This relationship indicates that at a constant vessel radius, changes in flow are proportionate to changes in velocity, and visa versa. Another important relationship to be derived from above is that velocity, at constant flow, is inversely related to the radius squared (V ∝ 1 / r2 at constant flow).
What happens to blood flow when the vessel radius decreases?
It is important to note that a small change in vessel radius will have a very large influence (4th power) on its resistance to flow; e.g., decreasing vessel diameter by 50% will increase its resistance to flow by approximately 16 fold. Importantly, flow will only occur when a pressure difference exists.
How does blood vessel diameter affect blood flow?
In blood vessels, most of the resistance is due to vessel diameter. As vessel diameter decreases, the resistance increases and blood flow decreases. Very little pressure remains by the time blood leaves the capillaries and enters the venules.
How does vessel diameter affect blood flow?
In blood vessels, most of the resistance is due to vessel diameter. As vessel diameter decreases, the resistance increases and blood flow decreases. Very little pressure remains by the time blood leaves the capillaries and enters the venules.
What causes radius to change vessels?
The reason for this is that vessel diameter changes because of contraction and relaxation of the vascular smooth muscle in the wall of the blood vessel. Furthermore, as described below, very small changes in vessel diameter lead to large changes in resistance.
Do blood vessels change diameter?
It was found that the venous diameter decreased in early systole, increasing thereafter to a maximum level in early diastole and then declined towards end diastole. The maximum change of 4.82% (between early systole and early diastole) (p = 0.03) represents a 9.83% change in volumetric blood flow.