Multiple Choice
In human blood, which formed element is the most abundant by number in a typical healthy adult?
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17. The Blood
Introduction To Blood
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In a typical healthy adult, approximately what percentage of whole blood volume is composed of plasma?
A
About 55%
B
About 75%
C
About 45%
D
About 25%
Verified step by step guidance1
Understand that whole blood is composed of two main components: plasma and formed elements (such as red blood cells, white blood cells, and platelets).
Recall that plasma is the liquid portion of blood, which carries nutrients, hormones, and waste products, and typically makes up the majority of blood volume.
Remember the typical percentage ranges for plasma in whole blood volume in a healthy adult, which is generally around 55%.
Compare the given answer choices to this known physiological value to identify the correct percentage.
Conclude that the approximate percentage of plasma in whole blood volume is about 55%, based on standard human physiology data.
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