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When a client is to receive a unit of packed red blood cells, what is the nurse's first action?
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17. The Blood
Introduction To Blood
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Which component of blood makes up approximately 55 percent of the blood volume?
A
Red blood cells
B
Platelets
C
White blood cells
D
Plasma
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Understand the composition of blood: Blood is composed of plasma and formed elements, which include red blood cells, white blood cells, and platelets.
Recognize that plasma is the liquid portion of blood, which serves as a medium for transporting nutrients, hormones, and waste products.
Recall that plasma is primarily made up of water (about 90%), but also contains proteins, glucose, electrolytes, and other dissolved substances.
Identify that the formed elements (red blood cells, white blood cells, and platelets) make up the remaining 45% of blood volume.
Conclude that since plasma makes up the majority of the blood volume, it accounts for approximately 55% of the total blood volume.
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