Concept:Antidiuretic hormone (ADH) production is regulated by the osmotic pressure of the blood; when blood water levels are high, ADH decreases.
Explanation:ADH is normally released when the osmotic pressure of the blood increases.
This causes the kidneys to reabsorb more water, conserving body fluid.
When a person drinks large quantities of water, the extra water enters the bloodstream.
As a result, the osmotic pressure of the blood falls.
The hypothalamus and pituitary gland detect this lower osmotic pressure.
Consequently, the production and release of ADH are reduced.
Less ADH means the kidneys reabsorb less water and produce more dilute urine.
Therefore, among the given conditions, drinking large quantities of water causes a decrease in ADH production.
Answer:B. Drinking large quantities of water