Cell injury and death · USMLE Step 1

Cells undergoing apoptosis release cytochrome c. Which cellular structure releases it?

  1. Nucleus
  2. Endoplasmic reticulum
  3. Mitochondria
  4. Lysosomes
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Correct answer: Mitochondria

Mitochondria release cytochrome c, initiating the caspase cascade in apoptosis.

Difficulty: Medium Question 15 of 20

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