An increase in the osmolarity of the blood supplying the hypothalamus is a powerful stimulus for thirst.

Question

Quizplus · Accepted Answer

An increase in the osmolarity (concentration of solutes) of the blood supplying the hypothalamus triggers thirst because it indicates that the body has less water than it needs. This is detected by specialized cells in the hypothalamus called osmoreceptors, which then send signals to increase thirst and ultimately restore the body's water balance.

An Increase in the Osmolarity of the Blood Supplying the Hypothalamus