Antidiuretic hormone (ADH) increases a. water reabsorption in the collecting tubule of the kidney. b. urinary output. c. sodium reabsorption in the distal tubule of the kidney. d. potassium secretion in the distal tubule of the kidney.

WATER REABSORPTION IN THE COLLECTING TUBULE OF TE KIDNEY

Explanation:

Antidiuretic hormone synthesized by the neurons in the hypothalamus and the posterior pituitary allows for the reabsorption of water from the collecting ducts of the kidneys back into the circulation.

This therefore reduces the amount of water in the urine causing the formation of concentrated urine and reduced volume of urine.

It causes the increased reabsorption of sodium in the ascending loop of Henle adding to the counter-current mechanism which aids the further reabsorption of water from the distal tubules and collecting ducts.

It also allows the constriction of arteries thereby reducing arterial blood pressure.

The correct answer is: A) increases water reabsorption in the collecting tubule of the kidney.

Explanation:

Antidiuretic hormone (ADH), also known as vasopressin, is an hormone synthesized in the hypothalamus.

ADH acts on 1) the kidneys (increases water reabsorption) and 2) the blood vessels (constricts arterioles, which increases blood pressure).

ADH is secreted when the plasma osmolarity increases (this means that the plasma is more concentrated than it should be, so the water reabsorption helps the plasma to return to its original osmolarity). ADH secretion can also be stimulated by a decrease in blood pressure.

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