Suppose the flow rate of blood in a coronary artery has been reduced to half its normal value by plaque deposits. By what factor has the radius of the artery been reduced, assuming no turbulence occurs. Hint: The heart tries to maintain constant pressure difference across arteries in both cases. Think and Prepare 1. What is the relationship between the flow rate Q and the radius of an artery for a given length, pressure gradient and viscosity? r plaque no plaque =

The plug has a diameter of 30 mm and fits within a rigid sleeve having an inner diameter of 32 mm. Both the plug and the sleeve are 50 mm long. The plug is made from a material for which E= 1 MPa, v=0.7. (Figure 1) Figure Part A Determine the axial pressure p that must be applied to the top of the plug to cause it to contact the sides of the sleeve. Express your answer to three significant figures and include appropriate units. HA P= Submit Part B Value 8 = Request Answer Also, how far must the plug be compressed downward in order to do this? Express your answer to three significant figures and include appropriate units. μÅ 3 Value Submit Provide Feedback Units Request Answer IWIC ? Units www. ?

A liquid is flowing through a horizontal pipe whose radius is 0.0301 m. The pipe bends straight upward through a height of 8.80 m and joins another horizontal pipe whose radius is 0.0726 m. What volume flow rate will keep the pressures in the two horizontal pipes the same? Number Units 202

Assume that the left side of your heart creates a pressure of 121 mm Hg by exerting a force directly on the blood over an effective area of 16.0 cm2. What force (in N) does it exert to accomplish this? N

Predict the hydraulic conductance, Lp, for Starling's equation for flow through the wall of a capillary. Assume that all proteins are strained out. > for a total capillary surface area (entire body) of 500 m?. > Assume the following, the entire cleft region, surface area is 0.5 m2, > an average tortuosity of 1.8, > average cleft pore radius of 3.5 nm, and > average thickness of endothelial lining of 0.5 mm. Give you answer with 3 significant figures in Sl units L, x 10^ m s kg =

A typical blood pressure is 120 mm Hg. How high above the injection site would you need to hang an IV bag so that the fluid enters the blood stream at this pressure? Assume the IV fluid has a density of 1000 kg/m3. Remember, 1 mm Hg = 133 Pa

Water travels through a pipe at 11.1 m/s. The pipe expands from a crossectional area of 1.5 m2 to an area of 12.0 m2. What is the speed of the water in the second part of the pipe in m/s? How much is the pressure change in KPa as the pipe expands? The density of water is 1000 kg/m3. Enter a positive value for an increase in pressure, a negative value for a decrease.