College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 12, Problem 26CQ
Doppler ultrasound can be used to the speed of blood in the body. If there is a partial constriction of an artery, where would you expect blood speed to be greatest, at or nearby the constriction? What are the two distinct causes of higher resistance in the constriction?
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Chapter 12 Solutions
College Physics
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Similar questions
- The heart of a resting adult pumps blood at a rate of 5.00 L/min. (a) Convert this to cm3/s. (b) What is this rate m3/s?arrow_forwardDoppler ultrasound can be used to measure the speed of blood in the body. If there is a constriction of an artery, where would you blood speed to be greatest: at or after the constriction? What are the two distinct causes of higher resistance the constriction?arrow_forwardAngioplasty is a technique in which arteries partially blocked with plaque are dilated to increase blood flow. By what actor must the radius of an artery be increased in order to increase blood by a factor of 10?arrow_forward
- (a) Convert normal blood pressure readings of 120 over 80 mm Hg to newtons per meter squared using be relationship for pressure due to the weight of a fluid (p=hg) rater a conversion factor. (b) Explain why be blood pressure of an infant would likely be smaller than that of an adult. Specifically, consider the smaller height to which blood mast be pumped.arrow_forwardThe human circulation system has approximately 1109 capillary vessels. Each vessel has a diameter of about 8 m. Assuming cardiac output is 5 L/min, determine the average velocity of blood flow through each capillary vessel.arrow_forwardDuring a marathon race, a runner's blood flow increases to 10.0 times her resting rate. Her blood's viscosity has dropped to 95.0% of its normal value, and the blood pressure difference across the circulatory system has increased by 50.0%. By what factor has the average radii of her blood vessels increased?arrow_forward
- The human circulation system has approximately 1109 vessels. Each vessel has a diameter of about 8m . Assuming cardiac output is 5 L/min, determine the average velocity of blood flow through each capillary vessel.arrow_forwardBlood is pumped from the heart at a rate of 5.0 L/min into the aorta (of radius 1.0 cm). Determine the speed of blood through the aorta.arrow_forwardIs there a limit to the height to which an entrainment device can raise a fluid? Explain your answer.arrow_forward
- When physicians diagnose arterial blockages, they quote reduction flow rate. If the flow rate an artery has been reduced to 10.0% of its normal value by a blood clot and be average pressure difference has increased by 20.0%, by what factor has the clot reduced the radius of the artery?arrow_forwardThe flow of blood through a 2.00106 m -radius capillary is 3.80109cm3/s . (a) What is the speed of be blood now? (b) Assuming all the blood in the body passes through capillaries, how many of them must there be to carry a total flow of 90.0 cm3/s?arrow_forwardDuring a marathon race, a runner's blood flow increases to 10.0 times her resting rate. Her blood's viscosity dropped to 95.0% of its normal value, and the blood pressure difference across the circulatory system has increased by 50.0%. By what factor bas be average radii of her blood vessels increased?arrow_forward
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