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What is the life span of RBC?

  • A.120 days
  • B.100 days
  • C.130 days
  • D.110 days

Answer: A

A red blood cell lives about 120 days. Having no nucleus it cannot repair itself, and it is eventually broken down in the spleen and liver.

The bone marrow replaces about two million of them every second to keep the count steady.

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