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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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What is One major physiological factors that triggers thirst?

One major physiological factor that triggers thirst is the increase in osmolarity of the blood, which occurs when there is a loss of water, leading to a higher concentration of solutes. This change is detected by osmoreceptors in the hypothalamus, prompting the sensation of thirst to encourage fluid intake. Additionally, hormonal signals, such as the release of antidiuretic hormone (ADH), can further stimulate thirst and help regulate water balance in the body.


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