Pituitary and Thyroid Physiology · Physiology

In a healthy individual, which of the following is the strongest stimulus for the release of ADH?

  1. Increase in plasma osmolarity
  2. Increase in mean arterial pressure
  3. Decrease in plasma potassium levels
  4. Decrease in blood pH
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Correct answer: Increase in plasma osmolarity

Osmoreceptors in the hypothalamus are extremely sensitive to changes in plasma osmolarity. Even a 1% increase in osmolarity will trigger ADH release to conserve water and return osmolarity to normal.

Difficulty: Medium Question 39 of 40

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