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Hormone which regulates water balance :

  • A.Antidiuretic hormone
  • B.Insulin
  • C.Prolactin
  • D.Thyroxine

Answer: A

Water balance is regulated by the antidiuretic hormone (ADH, vasopressin).

ADH is made in the hypothalamus and released from the posterior pituitary when the blood becomes concentrated. It makes the collecting ducts of the kidney permeable to water, so more water is reabsorbed and a smaller volume of concentrated urine is passed. Lack of it causes diabetes insipidus.

Insulin regulates blood glucose, prolactin stimulates milk production, and thyroxine sets the basal metabolic rate; none of them is the hormone of water balance.

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