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26. Increasing density of erythrocytes in blood increases its capacity to carry oxygen. However, the viscosity of the blood increases with hematocrit and the blood flows less easily. One might hypothesize that there is an optimum hematocrit for oxygen carriage. Viscosity does not increases linearly with hematocrit. In one study, for hematocrits of 20, 35, 52, and 62%, viscosities were found to be 1.4, 2.0, 3.0, and 4.0 centipoise (a unit for measuring viscosity). Since flow rates vary inversely with viscosities, the relative rates at which erythrocytes (and the oxygen they carry) flow through blood vessels can be found by dividing the hematocrit values by their respective viscosities. What are these ratios for the four hematocrit values? Is there an optimum erythrocyte concentration for blood flow? How well does it correspond to the typical values for men and women (about 45% and 40% respectively)?

26. Increasing density of erythrocytes in blood increases its capacity to carry oxygen. However, the viscosity of the blood increases with hematocrit and the blood flows less easily. One might hypothesize that there is an optimum hematocrit for oxygen carriage. Viscosity does not increases linearly with hematocrit. In one study, for hematocrits of 20, 35, 52, and 62%, viscosities were found to be 1.4, 2.0, 3.0, and 4.0 centipoise (a unit for measuring viscosity). Since flow rates vary inversely with viscosities, the relative rates at which erythrocytes (and the oxygen they carry) flow through blood vessels can be found by dividing the hematocrit values by their respective viscosities. What are these ratios for the four hematocrit values? Is there an optimum erythrocyte concentration for blood flow? How well does it correspond to the typical values for men and women (about 45% and 40% respectively)?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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26. Increasing density of erythrocytes in blood increases its capacity to carry oxygen. However, the viscosity of the blood increases with hematocrit and the blood flows less easily. One might hypothesize that there is an optimum hematocrit for oxygen carriage. Viscosity does not increases linearly with hematocrit. In one study, for hematocrits of 20, 35, 52, and 62%, viscosities were found to be 1.4, 2.0, 3.0, and 4.0 centipoise (a unit for measuring viscosity). Since flow rates vary inversely with viscosities, the relative rates at which erythrocytes (and the oxygen they carry) flow through blood vessels can be found by dividing the hematocrit values by their respective viscosities. What are these ratios for the four hematocrit values? Is there an optimum erythrocyte concentration for blood flow? How well does it correspond to the typical values for men and women (about 45% and 40% respectively)?
Transcribed Image Text:26. Increasing density of erythrocytes in blood increases its capacity to carry oxygen. However, the viscosity of the blood increases with hematocrit and the blood flows less easily. One might hypothesize that there is an optimum hematocrit for oxygen carriage. Viscosity does not increases linearly with hematocrit. In one study, for hematocrits of 20, 35, 52, and 62%, viscosities were found to be 1.4, 2.0, 3.0, and 4.0 centipoise (a unit for measuring viscosity). Since flow rates vary inversely with viscosities, the relative rates at which erythrocytes (and the oxygen they carry) flow through blood vessels can be found by dividing the hematocrit values by their respective viscosities. What are these ratios for the four hematocrit values? Is there an optimum erythrocyte concentration for blood flow? How well does it correspond to the typical values for men and women (about 45% and 40% respectively)?
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