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 Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter11: The Blood
Section: Chapter Questions
Problem 3SQE
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