A) volume of urine increases
B) volume of urine decreases
C) volume of urine is normal
D) volume of urine is unaffected
Correct Answer: A
Solution :
Antidiuratic Hormone (ADH or vasopressin) is secreted from the posterior lobe of pituitary. The injection of extremely minute quantity of ADH (as small as 2 nanograms) can cause decreased excretion of water in the urine. In the absence of ADH the collecting tubules and ducts become almost impermeable to water which prevent significant reabsorbtion of water and therefore allow extreme loss of water in urine. Conversaly in the presence of ADH the permeability of collecting ducts and tubules to water increase greatly and allows most of water to be a reabsorbed as the tubular fluid passes through these ducts thereby conserving water in body.
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