Multiple Choice
In an introductory blood donation context, if 1 vial contains 10 mL of blood and , approximately how many pints of blood are in 7 vials?
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17. The Blood
Introduction To Blood
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In human blood, which component makes up the largest proportion by volume?
A
Plasma
B
Leukocytes (white blood cells)
C
Platelets
D
Erythrocytes (red blood cells)
Verified step by step guidance1
Step 1: Understand the components of human blood. Blood is composed of plasma, erythrocytes (red blood cells), leukocytes (white blood cells), and platelets.
Step 2: Recall the relative proportions of these components by volume. Plasma is the liquid portion of blood, while erythrocytes, leukocytes, and platelets are cellular components.
Step 3: Recognize that plasma makes up the majority of blood volume, typically around 55%, while erythrocytes make up about 40-45%, and leukocytes and platelets together make up less than 1%.
Step 4: Conclude that since plasma is the liquid matrix and carries the cells, it occupies the largest volume proportion in human blood.
Step 5: Therefore, the component that makes up the largest proportion by volume in human blood is plasma.
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