Thirst is a physical sensation. It stimulates a desire to drink more fluid. The thirst sensation is controlled by the mouth and the hypothalamus - a part of the brain that also controls body temperature, appetite and sodium concentration of the blood.
When sodium concentration in the blood is too high, recpetors in the hypothalamus are stimulated and thirst messages are sent to the brain to initiate behviour to quench thirst. At the same time the hypothalamus activates the release of an anti-diuretic hormone, to decrease water loss at the kidneys, causing urine that is excreted to be more concentrated.
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