In humans, the water content in the blood is regulated via the hormonal system.
Which of the following occur when the water content of the blood is too low?
1 pituitary gland releases less ADH
2 pituitary gland releases more ADH
3 increase in water reabsorption by the kidneys
4 decrease in water reabsorption by the kidneys
5 increased reabsorption of glucose in the kidneys
6 decreased reabsorption of glucose in the kidneys

Answer:

When the water content of the blood is too low, more ADH is released from the pituitary gland
(statement 2). The ADH then travels, via the blood stream, to the kidneys and increases the
permeability of the collecting ducts. More water is reabsorbed into the blood (statement 3). The water
concentration of the blood is not regulated by an increase or decrease in glucose reabsorption;
therefore statements 5 and 6 are not relevant for osmoregulation.
The answer is B