A healthy red blood cell usually remains in the circulation for approximately how long?
Correct answer: C. 120 days
- A. 10 days
- B. 30 days
- C. 120 days
- D. 365 days
Explanation
A normal red blood cell has an average lifespan of about 120 days before it is removed mainly by the spleen and liver. The shorter values are more consistent with severe cell destruction, while 365 days is too long.
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About Blood and Immunity
Blood and immunity covers plasma, red blood cells, white blood cells, platelets, haemoglobin, blood groups and haemostasis. It explains innate and adaptive defenses, antibodies, lymphocytes, inflammation, vaccination and immune memory, with a distinction between active and passive immunity and between antigen and antibody.
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