Average life span of red blood cell is about:
Correct answer: A. four months
- A. four months
- B. Five months
- C. Two months
- D. One month
Explanation
The average life span of a red blood cell (RBC) is about 120 days or four months. RBCs are produced in the bone marrow and are then released into the bloodstream. They carry oxygen from the lungs to the tissues. As RBCs age, they lose their ability to carry oxygen efficiently. After about 120 days, they are removed from the bloodstream by the spleen and liver. The iron from the hemoglobin in RBCs is recycled to make new RBCs.
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