Final answer:
ADH, or anti-diuretic hormone, is the hormone responsible for water regulation in the kidney, ensuring more water is reabsorbed to prevent dehydration.
Step-by-step explanation:
The hormone that controls water regulation in the kidney is ADH or anti-diuretic hormone. This hormone increases the membrane permeability to water in the collecting ducts of the nephron by adding aquaporins. As a result, ADH enables more water to be reabsorbed back into the bloodstream, which helps to prevent dehydration. Progesterone can bind to receptors for aldosterone and ADH, both of which are involved in water retention.
While hormones such as epinephrine and norepinephrine are associated with the 'fight or flight' response and do not play a direct role in water regulation, ADH's primary function is to regulate the body's osmotic balance by preventing water loss.