Stem Cells and Regeneration · USMLE Step 1

Which of the following organs is well-known for containing adult stem cells that continuously regenerate tissue under normal physiologic conditions?

  1. Brain cortex
  2. Skeletal muscle (myofibers)
  3. Bone marrow
  4. Cardiac muscle
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Correct answer: Bone marrow

Bone marrow contains hematopoietic stem cells, which continuously replenish blood and immune cells through self-renewal and differentiation — a classic example of adult stem cell mediated tissue regeneration.

Difficulty: Medium Question 8 of 20

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