As evidenced in this experiment, with the increase of the blood vessel length, there was a decrease in blood flow. The plot for pressure in linear in that, an increase in pressure is directly proportional to flow rate. The blood vessels dilate to increase the flow to where the blood is needed in the body. Since liquids are essentially incompressible, the equation of continuity is valid for all liquids. Count the number of elementary bodies you see through the microscope recall that elementary bodies stain green , enter the number of elementary bodies in the field below, and then click Submit Data to display your results in the grid. Please put in your own words, if needed! Simple diffusion moves molecules from an area of higher concentration to an area of lower concentration without an input of energy. When vascular disease causes stiffening of arteries, compliance is reduced and resistance to blood flow is increased.
Describe the relationship between flow tube length and fluid flow rate. In the body, where does the driving pressure for fluid flow come from? In regards to tube length, this is drastically different than pressure because with an increase in tube length, there is a decrease in rate of flow because there is more resistance within the vessel itself. Explain whether it would be better to adjust heart rate or blood vessel diameter to achieve blood flow changes at a local level. Conversely, when a river empties into one end of a reservoir, the water slows considerably, perhaps picking up speed again when it leaves the other end of the reservoir. The heart alters stroke volume by altering the pump volume or the contractility.
How well did the results compare with your prediction. Hint: Look at the relationship of the variables in the equation. The greater the compliance of an artery, the more effectively it is able to expand to accommodate surges in blood flow without increased resistance or blood pressure. If you put the same amount of glucose in the right beaker as in the left, would you be able to observe any diffusion? Contents A job description for the cardiovascular system. An increase in blood viscosity directly affects blood flow, in that blood flow would decrease.
Since pressure in the veins is normally relatively low, for blood to flow back into the heart, the pressure in the atria during atrial diastole must be even lower. The sodium-potassium pump is classified as a n You correctly answered: a. When viscosity increases, it makes blood thicker and decreases blood flow. Adipose tissue does not have an extensive vascular supply. The right beaker represents the side of the heart that delivers blood to the system of the body. As a result, compliance is reduced.
You experience more resistance and therefore less flow from the milkshake. Thus, when the stroke volume decreases, the heart rate music increase to maintain cardiac output. Which of the following statements is true? Micrograph provided by the Regents of University of Michigan Medical School © 2012 Sometimes a plaque can rupture, causing microscopic tears in the artery wall that allow blood to leak into the tissue on the other side. The bigger the radius, the more laminar flow of fluid. Plus, the best way to control blood flow, as seen from these experiments is through increasing vessel radius. .
The increase of flow tube radius increased the flow rate, as predicted. Chlamydia trachomatis is You correctly answered: c. Was the effect of viscosity greater or less than the effect of radius on fluid flow? In a partially blocked coronary artery, what happens to vessel radius and what effects does this have on blood flow? The components of blood pressure include systolic pressure, which results from ventricular contraction, and diastolic pressure, which results from ventricular relaxation. Explain how the body establishes a pressure gradient for fluid flow. Ischemia in turn leads to hypoxia—decreased supply of oxygen to the tissues. The following is a brief description of the parameters that govern flow through a given vessel.
Predict Question 2: Do you think the addition of glucose carriers will affect the transport of sodium or potassium? When the flow tube radius increases, the flow rate also increases. If one increases, so does the other going in a straight line! If resistance is decreasing, there is an increase in flow rate. In other words, speed increases when cross-sectional area decreases, and speed decreases when cross-sectional area increases. The infectious form of Chlamydia that is spread from person to person is the You correctly answered: d. This expansion and recoiling effect, known as the pulse, can be palpated manually or measured electronically. The two major variables that affect the rate of diffusion: a. D is directly proportional to the resistance of the arterioles leading to them.
In arteriosclerosis, compliance is reduced, and pressure and resistance within the vessel increase. The radius and blood flow are directly proportional to each other. Any factor that causes cardiac output to increase, by elevating heart rate or stroke volume or both, will elevate blood pressure and promote blood flow. Explain why you think blood vessel radius can have a larger effect on the body that changes in blood vessel length. To define resistance and describe the main factors affecting resistance 3.
If the blood speed increases by a factor of 4. To prevent subsequent collapse of the vessel, a small mesh tube called a stent is often inserted. It is pumped from the heart into the arteries at high pressure. For comparison, this value is equivalent to about 200 times the volume of water contained in a 6-lane 50-m lap pool. The nozzle produces a considerably faster stream merely by constricting the flow to a narrower tube.
Thus, we have an inverse relationship between blood vessel resistance and the blood flow rate - the higher the resistance, the slower the flow rate. The slowing or blocking of blood flow is called resistance. Explain one way in which facilitated diffusion is the same as simple diffusion and one way in which it differs. The contraction of skeletal muscles surrounding a vein compresses the blood and increases the pressure in that area. Describe the effect that radius changes have on the laminar flow of a fluid. The movement of sodium and potassium maintained by the Na+ -K+ pump You correctly answered: e.