College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Chapter 12, Problem 35PE
The arterioles (small arteries) leading to an organ, constrict in order to decrease flow to the organ. To shut down an organ, blood flow is reduced naturally to 1.00% of its original value. By what factor did the radii of the arterioles constrict? Penguins do this when they stand on ice to reduce the blood flow to their feet.
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The arterioles (small arteries) leading to an organ, constrict in order to decrease flow to the organ. To shut down an organ, blood flow is reduced naturally to 2.10% of its original value. By what factor did the radii of the arterioles constrict? Penguins do this when they stand on ice to reduce the blood flow to their feet.
A major artery with a cross-sectional area of 0.95 cm2 branches into 18 smaller arteries, each with an average cross-sectional area of 0.39 cm2.
By what factor is the average speed of the blood reduced when it passes into these branches?
v2/v1=
A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque. To
do this, she measures the blood pressure just before the region of blockage and finds that it is P₁, while in
the region of blockage it is P2. Furthermore, she knows that blood flowing through the normal artery just
before the point of blockage is traveling at v₁, and the density of this patient's blood is p. The patient is
laying down so there are no differential effects due to gravity.
a. Symbolically, what is the ratio of the artery radius at the blockage, r2, to the ratio of the artery
radius at the blockage, r₁? (find r₂/r₁)
b. Find the numerical value of r2/r1. P₁ = 1.20x104 Pa, P₂=1.15×104 Pa, v₁ =30.0 cm/s, p = 1060
kg/m³.
Chapter 12 Solutions
College Physics
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