How hormones cause the response when the intake of water is low?

When water intake is low, the body detects increased plasma osmolarity, prompting the release of antidiuretic hormone (ADH) from the posterior pituitary gland. ADH acts on the kidneys to increase water reabsorption, leading to concentrated urine and reduced water loss. Additionally, the hormone aldosterone may be released, promoting sodium retention, which helps to retain water in the body. Together, these hormonal responses help to maintain fluid balance and blood pressure during periods of low water intake.