Endocrine regulation · USMLE Step 1

Which of the following best describes the role of the median eminence in endocrine regulation?

  1. It stores and releases cortisol into the blood
  2. Where hypothalamic releasing hormones enter the portal blood
  3. It directly secretes thyroid hormone into circulation
  4. It converts thyroxine (T4) to active T3
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Correct answer: Where hypothalamic releasing hormones enter the portal blood

The median eminence is a hypothalamic region where releasing hormones are secreted into the hypophyseal-portal blood vessels and transported to the anterior pituitary to regulate pituitary hormone secretion.

Difficulty: Medium Question 19 of 23

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