# Describe the relationship between vessel radius and blood flow rate. Physio Ex Lab Exercise 5 Cardiovascular Dynamics 1 2022-10-20

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The relationship between vessel radius and blood flow rate is an important factor in the functioning of the circulatory system. This relationship can be described by the equation known as Poiseuille's law, which states that the flow rate of a fluid through a vessel is directly proportional to the fourth power of the radius of the vessel, and inversely proportional to the length and viscosity of the fluid.

In practical terms, this means that as the radius of a vessel increases, the flow rate of blood through that vessel also increases. This is because a larger radius allows for a larger cross-sectional area through which the blood can flow, making it easier for the blood to pass through. On the other hand, if the radius of a vessel decreases, the flow rate of blood through that vessel will also decrease, as the smaller radius restricts the flow of blood.

This relationship between vessel radius and blood flow rate is particularly important in the small arteries and arterioles that make up the microvasculature of the body. The radius of these vessels can change in response to various physiological and environmental factors, such as changes in blood pressure, blood flow, and the presence of certain chemicals. This allows the body to regulate blood flow to different organs and tissues in response to changing needs, ensuring that each organ and tissue receives an appropriate amount of oxygen and nutrients.

In summary, the relationship between vessel radius and blood flow rate is an important factor in the functioning of the circulatory system, and is regulated by the body to ensure that different organs and tissues receive an appropriate amount of blood flow. Understanding this relationship is crucial for understanding how the circulatory system works, and is also important in the diagnosis and treatment of various cardiovascular diseases.

## Physio Ex Lab Exercise 5 Cardiovascular Dynamics 1

This slow flow rate allows more time for the exchange of substances between the blood and cells to occur. Although the diameter of an individual capillary is significantly smaller than the diameter of an arteriole, there are vastly more capillaries in the body than there are other types of blood vessels. Kilang Jahit Pukal Lrs Individu Jahit Pukal Large SERVIS JAHIT PUKAL DGN KILANG JAHIT LRS DENGAN HARGA PUKAL. Normally,the mean arterial blood pressure falls within the range of 70â€”110mmHg,so 100 is normal. The usual pressure difference between the left and right ventricles is about 100 mmHg. As more air is released from the cuff, blood is able to flow freely through the brachial artery and all sounds disappear. Recall that the pressure in the atria, into which the venous blood will flow, is very low, approaching zero for at least part of the relaxation phase of the cardiac cycle.

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## Physioex 5 questions

Liver abnormalities include hepatitis, cirrhosis, alcohol damage, and drug toxicities. They have an inverse relationship. For example, imagine sipping milk, then a milkshake, through the same size straw. Blood vessel length is directly proportional to its resistance: the longer the vessel, the greater the resistance and the lower the flow. The equation states that flow rate is proportional to the radius to the fourth power, meaning that a small increase in the internal diameter of the cannula yields a significant increase in flow rate of IV fluids.

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## Describe the Relationship Between Vessel Radius and Blood Flow Rate

Venous System The pumping action of the heart propels the blood into the arteries, from an area of higher pressure toward an area of lower pressure. The effect of vessel diameter on resistance is inverse: Given the same volume of blood, an increased diameter means there is less blood contacting the vessel wall, thus there is less friction and less resistance, subsequently increasing flow. Skeletal Muscle Pump In many body regions, the pressure within the veins can be increased by the contraction of the surrounding skeletal muscle. The Roles of Vessel Diameter and Total Area in Blood Flow and Blood Pressure Recall that we classified arterioles as resistance vessels, because given their small lumen, they dramatically slow the flow of blood from arteries. We also registered under Ministry of Finance MOF in Malaysia and supply high-quality uniform.

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## Describe the relationship between radius and blood flow rate Free Essays

The technique of measuring blood pressure requires the use of a sphygmomanometer a blood pressure cuff attached to a measuring device and a stethoscope. This pressure gradient drives blood back toward the heart. You correctly answered: The flow rate decreased. Pulse, the expansion and recoiling of an artery, reflects the heartbeat. This action forces blood closer to the heart where venous pressure is lower.

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## Physio Ex Exercise 5 Activity 3

Contents1 Is a 3 vessel aortic arch normal? Thus, venoconstriction increases the return of blood to the heart. Diabetes would decrease blood flow because it changes the elasticity of the blood vessels making them narrower which means radius is smaller and radius has a directly proportional relationship with blood flow. Anne Franks relationship between her mother and father were very different. However, obesity, poor nutrition, lack of physical activity, and tobacco use all are major risk factors. Please note that even if the equation looks intimidating, breaking it down into its components and following the relationships will make these relationships clearer, even if you are weak in math. Venoconstriction, while less important than arterial vasoconstriction, works with the skeletal muscle pump, the respiratory pump, and their valves to promote venous return to the heart. Compliance Compliance is the ability of any compartment to expand to accommodate increased content.

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## 20.2 Blood Flow, Blood Pressure, and Resistance

This expansion and recoiling effect, known as the pulse, can be palpated manually or measured electronically. Disorders of the 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. They have an active site to which specific substrate binds. Relating to the blood flow equation, the radius is taken to the fourth power. The influence of lumen diameter on resistance is dramatic: A slight increase or decrease in diameter causes a dramatic decrease or increase in resistance. Depending upon the local needs of nutrients and oxygen by the tissues, blood vessels will increase or decrease their radii by altering the amount of contraction of the smooth muscle in the tunica media. Resistance When the right flow tube radius increases resistance decreases.

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## Yacht Club

A decreased diameter means more of the blood contacts the vessel wall, and resistance increases, subsequently decreasing flow. This is a leading cause of hypertension and coronary heart disease, as it causes the heart to work harder to generate a pressure great enough to overcome the resistance. Therefore blood flow is strongly proportional to the vessel radius. Pulse Pressure As shown in pulse pressure. Describe the relationship between vessel radius and blood flow rate.

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## Relationship between Flow Rate and Vessel Diameter, Length, and Fluid Viscosity.

Although there are five recognized Korotkoff sounds, only two are normally recorded. The longer a blood vessel the more surface area there is to cause resistance, by friction, to blood flow which lowers flow rate. It is initiated by the contraction of the ventricles of the heart. One of several things this equation allows us to do is calculate the resistance in the vascular system. This explains why vasodilation and vasoconstriction of arterioles plays a more significant role in regulating blood pressure than do the vasodilation and vasoconstriction of other vessels.

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