USMLE

Ovulation

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Reproductive
  1. Follicular Phase
  2. Luteal Phase
  3. Ovulation
  4. Spermatogenesis
  5. Sperm Structure
  6. Testes
  7. Epididymis

Summary

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Key Points

  • Ovulation
    • Release of eggs (oocytes)
      • From ovary into the Fallopian tube
    • Triggered by luteal hormone (LH) Surge
      • Dramatic increase in luteinizing hormone (LH)
      • Positive Feedback Loop between Estrogen and LH
        • Normally, estrogen inhibits LH secretion (negative feedback homeostatic regulation)
        • However, once estrogen levels rise past a certain threshold, it paradoxically starts to increase LH secretion, creating the surge