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20. A catheter is inserted into a blood vessel to measure the local blood pressure, velocity and to view the inside wall of the artery. The local pressure was found to be 1.4x10¹ Pa and the blood had a velocity of 0.4m/s is in the unconstructed part of the vessel. The inside diameter of the vessel is 2 cm and a region of the aorta is found with a deposit that reduces the diameter by 30%. Assume that the blood has a density of 1060 kgm and ignore viscous friction. a) Find the blood velocity through the constricted region. b) Find difference between the blood pressure in the constricted region compared to the rest of the artery. Express this in a percentage of the total blood pressure. c) Does this result help to quantify the effect that a constriction has on the blood flow rate?​