Final answer:
ADH (antidiuretic hormone) is the hormone that decreases the amount of urine produced by promoting water reabsorption in the kidneys.
Step-by-step explanation:
The hormone that tends to decrease the amount of urine produced is ADH (antidiuretic hormone). ADH promotes water reabsorption in the kidneys, which leads to less urine production. It does this by stimulating the insertion of aquaporin water channels into cell membranes in the collecting ducts of the kidneys, allowing water to be reabsorbed back into the bloodstream.