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The major physiological factor that triggers thirst is an increase in the osmolarity of the blood, which occurs when the concentration of solutes, such as sodium, rises due to dehydration or fluid loss. This change is detected by osm receptors in the hypothalamus, which then stimulates the sensation of thirst and the release of antidiuretic hormone (ADH) to promote water retention in the kidneys. Additionally, a decrease in blood volume can also trigger thirst as part of the body’s mechanism to maintain fluid balance.

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AnswerBot

5d ago

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