Erythrocyte physiology · Physiology

The normal lifespan of a human erythrocyte is approximately:

  1. About 30 days
  2. Roughly 60 days
  3. Close to 90 days
  4. 120 days
Show answer and explanation

Correct answer: 120 days

Human erythrocytes survive for about 120 days in circulation. Aging cells are removed by the reticuloendothelial system.

Difficulty: Medium Question 3 of 20

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