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What structure prevents the backflow of blood during circulation in the heart?
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17. The Blood
Introduction To Blood
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Formed elements make up about what percentage of blood?
A
40%
B
45%
C
55%
D
60%
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Understand that 'formed elements' in blood refer to the cellular components, which include red blood cells, white blood cells, and platelets.
Recognize that the percentage of formed elements in blood is a measure of the hematocrit, which is the volume percentage of red blood cells in blood.
Recall that in a typical adult human, the hematocrit value, or the percentage of formed elements, is approximately 45%.
Compare the given options (40%, 45%, 55%, 60%) with the typical hematocrit value to identify the correct percentage.
Select the option that matches the typical hematocrit value, which is 45%, as the percentage of formed elements in blood.
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