Final answer:
ADH secretion is stimulated when osmoreceptors in the hypothalamus detect a decrease in blood osmolality.
Step-by-step explanation:
ADH secretion is stimulated when osmoreceptors in the hypothalamus detect a decrease in blood osmolality.
Dehydration or physiological stress can cause an increase of osmolarity above 300 mOsm/L, which in turn raises ADH secretion and water will be retained, causing an increase in blood pressure.
ADH travels in the bloodstream to the kidneys. Once at the kidneys, ADH changes the kidneys to become more permeable to water by stimulating the temporary insertion of water channels, aquaporins, into the kidney tubules.
Water moves out of the kidney tubules through the aquaporins, reducing urine volume.
The water is reabsorbed into the capillaries, lowering blood osmolarity back toward normal.
As blood osmolarity decreases, a negative feedback mechanism reduces osmoreceptor activity in the hypothalamus, and ADH secretion is reduced.
The statement is true.