Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN: 9781285866932
Author: Lauralee Sherwood
Publisher: Cengage Learning
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Chapter 11, Problem 3SQE
Summary Introduction
To calculate:
The total change in resistance due to increased hematocrit level in a person with polycythemia and its effect on peripheral resistance.
Introduction :
Polycythemia is one of the blood cancers, in which bone marrow in the body starts producing more red blood cells than usual. Due to the higher level of the red blood cells in the overall blood volume, the hematocrit (proportion of red blood cells in the blood) increases.
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Systemic blood pressure is defined as the ratio of two pressures—systolic and diastolic—both expressed in millimeters of mercury. Normal blood pressure is about 120mm/80mm which is usually just stated as 120/80. What would normal systemic blood pressure be if, instead of millimeters of mercury, we expressed pressure in each of the following units, but continued to use the same ratio format?
Part A)
atmosheres =
a)120/ 80
b) 2.32/ 1.54
c) 0.158/ 0.105
d) 1.60x10^4/ 1.06x10^4
Part B)
torr =
a) 120/ 80
b) 2.32/ 1.54
c) 0.158/ 0.105
d) 1.60x10^4/ 1.06x10^4
Part C)
Pa =
a)120/ 80
b) 2.32/ 1.54
c) 0.158/ 0.105
d) 1.60x10^4/ 1.06x10^4
Part D)
N/ m^2 =
a)120/ 80
b) 2.32/ 1.54
c) 0.158/ 0.105
d) 1.60x10^4/ 1.06x10^4
Part E)
psi =
a)120/ 80
b) 2.32/ 1.54
c) 0.158/ 0.105
d) 1.60x10^4/ 1.06x10^4
Total blood volume in the capillary tube is 20mm, the packed cell volume(red blood cells) is 7.1 mm, and the plasma portion measures 12.9mm.
How is hematocrit calculated?
What is the blood flow rate through a vessel given the following: ΔP = 120 mmHg; radius = 6 mm; length = 20 mm; and viscosity of the blood = 4.5? ? (conversion factors: 1 mmHg = 0.013 dynes/cm2 and a viscosity of 1.0 = 0.01 dyne sec/cm2)
Chapter 11 Solutions
Human Physiology: From Cells to Systems (MindTap Course List)
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