The pituitary hormone that causes a decrease in the amount of water lost in the kidneys is the antidiuretic hormone (ADH).
ADH is produced in the hypothalamus and released by the pituitary gland into the bloodstream. ADH works by increasing the permeability of the cells that line the collecting ducts of the kidneys.
This increases the reabsorption of water back into the body, thus reducing the amount of water that is lost. ADH also increases the permeability of the distal convoluted tubules, which allows for increased absorption of sodium and chloride.
The increased absorption of these ions helps to draw more water from the interstitial space, further reducing the amount of water that is lost. Additionally, ADH causes the release of aldosterone from the adrenal cortex, which helps to increase the retention of sodium and water in the kidneys.
Overall, ADH helps to reduce the amount of water lost in the kidneys and maintain a proper balance of water and electrolytes within the body.
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