Final answer:
Antidiuretic hormone (ADH) acts on the kidneys to retain water by influencing water reabsorption processes.
Explanation:
Antidiuretic hormone (ADH), also known as vasopressin, is produced in the hypothalamus and released by the posterior pituitary. It exerts its main effects on the kidneys by making the collecting ducts permeable to water, allowing for water reabsorption and conservation in the body.
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