It has been estimated that in a normal person plasma constitutes about ________ by volume of blood.
Correct answer: C. 55%
- A. 35%
- B. 45%
- C. 55%
- D. 75%
Explanation
Blood is composed of about 55% plasma and about 45% formed elements such as red blood cells, white blood cells and platelets. Plasma is the liquid part that transports cells, nutrients, hormones and wastes. Students may choose 45% because they confuse plasma with the packed cellular portion of blood.
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