How Well Do You Know the Lifespan and Removal of Human Red Blood Cells?
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Questions and Answers

What is the typical lifespan of human erythrocytes in circulation?

  • 60 days
  • 120 days (correct)
  • 150 days
  • 90 days

    • What happens to senescent or worn-out RBCs in the body?

  • They are removed from the circulation by macrophages (correct)
  • They are transported to the lungs for gas exchange
  • They are broken down by enzymes in the bloodstream
  • They are converted into white blood cells

    • What causes swelling or shape abnormalities in erythrocytes after 120 days of circulation?

  • Changes in the cells' surface oligosaccharide complexes
  • Neither A nor B
  • Both A and B (correct)
  • Defects in the membrane's cytoskeletal lattice

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