The other major factor that determines the rate of flow is the radius of the blood vessel(s) the blood moves through the arteries divide as they move away from the heart the rate of flow decreases for two reasons. A capillary is an extremely small blood vessel located within the tissues of the body that transports blood from arteries to veinscapillaries are most abundant in tissues and organs that are metabolically active for example, muscle tissues and the kidneys have a greater amount of capillary networks than do connective tissues. The biggest surprise in the application of poiseuille's law to fluid flow is the dramatic effect of changing the radius a decrease in radius has an equally dramatic effect, as shown in blood flow examples. Cardiovascular dynamics physio ex exercise 5 study explain why you think blood vessel radius can have a larger effect on the body than changes in blood vessel length radius is multiplied to the 4th power, length is not. A blood pressure that is too high (hypertension) can, over time, have detrimental health effects on organs such as the heart (myocardial infarction), the brain (stroke, hemorrhage), and kidneys (renal failure.
If a blood vessel breaks, tears, or is cut, blood leaks out, causing bleeding blood may flow out of the body, as external bleeding, or it may flow into the spaces around organs or directly into organs, as internal bleeding. Resistance is an accumulation of three different factors: blood viscosity, blood vessel length, and vessel radius  blood viscosity is the thickness of the blood and its resistance to flow as a result of the different components of the blood. General vasoconstriction of body vessels will increase whole body pressure, and blood flow can be total vessel length- more resistance is encountered in long vessels than short iii turbulence- occurs in the great arteries, and diameter of larger vessels b systemic blood pressure-1 arterial blood pressure- blood pressure in elastic and.
Where r = inside radius of the vessel, l = vessel length, and η = blood viscosity 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 eg, decreasing vessel diameter by 50% will increase its resistance to flow by approximately 16 fold. Compared to other smaller vessels in the body, the artery has a much bigger diameter (4 mm), therefore the resistance is low in addition, flow rate (q) is also the product of the cross-sectional area of the vessel and the average velocity (q=av. Factors that affect blood pressure graphics are used with permission of: • increased fatty tissue requires more blood vessels to service it and adds to the total vessel length in the body • the longer the total vessel length, the greater the resistance encountered, and the greater the blood does constriction of blood vessels raise. A blood vessel's radius has a larger effect on the body than thevessels length because more blood can flow through a larger bloodvessel a change in the radius will have more of a affect answered. Large blood vessels have faster rates of blood flow and higher pressure, but small total areas on the other hand, capillaries have a large total area , slow rate of flow and low pressure this allows time for nutrient exchange between the capillaries and tissue.
It should also be noted that vessel length is generally constant for a given vessel and that viscosity is a property of blood related to the ease with which it can be made to flow from the relationship among q , δ p and r , one finds that r depends on the geometry of the vessel and the viscosity of the blood as. 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 314) so a change in the radius of a vessel has a large. The influence of blood vessel diameter on peripheral resistance is: a insignificant because vessel diameter does not vary b significant because resistance is directly proportional to the blood vessel diameter c.
Identify the different types of blood vessels in the body vascular resistance - opposition to blood flow as a result of friction between blood and the walls of the blood vessels average blood vessel radius total blood vessel length the longer the vessel, the greater the resistance to flow. Therefore, a vessel having twice the length of another vessel (and each having the same radius) will have twice the resistance to flow similarly, if the viscosity of the blood increases 2-fold, the resistance to flow will increase 2-fold. Best answer: poiseuille's law states that the rate of flow through a tube is directly proportional to the fourth power of the radius and inversely proportional to the length so a change in the radius is going to have far more effect on the rate of flow than a change in the length the link below explains. The body creates blood clots as a normal response to blood vessel damage the main job of a blood clot is to seal the leak in a damaged blood vessel this prevents the blood from leaking out and protects the person from bleeding.
Blood that circulates throughout the body is pumped from the left ventricle of the heart it first enters into the high pressure arteries, where systolic blood pressure, the highest pressure. The blood vessel radius varies to a power of four which is why the changes are greater than blood vessel length changes. Changes in the volume of blood within the cardiovascular system will also affect bp if a person was severely dehydrated or lost a large quantity of blood through a wound there would be less blood for the heart to pump, thereby reducing cardiac output and bp. Resistance is related to vessel radius (the larger the radius, the lower the resistance), vessel length (the longer the vessel, the higher the resistance), blood viscosity, as well as the smoothness of the blood vessel walls.
Hypertension effects on the blood vessels and then you of course have the small arteries and arterioles and these are going to be at the high end you can have an aneurysm and an aneurysm is where you have a vessel-- let's say this is my vessel, and it's taking blood through it so blood is going through it and because of the. Blood vessels and blood pressure i introduction • length -- longer the vessel, greater surface area, greater resistance to flow • resistance changes achieved by varying radius of vessels o small change in radius, large change in resistance to blood flow and thus. Blood flow to all parts of the body is primarily regulated by blood pressure arterial blood pressure outweighs gravitational fluid pressure when i stand up, the pressure difference between my heart (reference level) and my feet in the veins is simply the pressure due to a column of blood (which is only slightly denser than water) about 1000mm tall.