Multiple choice

Which of the following statements concerning the water balance function of kidney is true?

  1. The key hormone regulating water reabsorption is secreted from the posterior pituitary gland.

  2. Aquaporin is the main hormone regulating water reabsorption.

  3. The vasa recta is the same structure as the loop of Henle.

  4. There are osmoreceptors in the pituitary gland.

  5. There is no limit to how much the body can concentrate urine.
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A Correct answer
Explanation

The main hormone regulating water reabsorption is anti-diuretic hormone (ADH or vasopressin). There are indeed osmoreceptors in the hypothalamus, which detect an increase in plasma osmolality. In response to input from these receptors and other stimuli, cells in the posterior pituitary gland release ADH.

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