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Questions and Answers
What is the average number of red blood cells in men per cubic millimeter of blood?
What is the average number of red blood cells in men per cubic millimeter of blood?
- 4.5 million
- 5.0 million (correct)
- 4.0 million
- 6.5 million
Which component makes up approximately 55% of an adult's blood?
Which component makes up approximately 55% of an adult's blood?
- Plasma (correct)
- Red blood cells
- White blood cells
- Platelets
What is the average lifespan of a red blood cell?
What is the average lifespan of a red blood cell?
- 120 days (correct)
- 150 days
- 90 days
- 60 days
Which part of the body does not contain a nucleus in mammals' red blood cells?
Which part of the body does not contain a nucleus in mammals' red blood cells?
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What substance do red blood cells contain that allows them to transport oxygen?
What substance do red blood cells contain that allows them to transport oxygen?
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