It regulates the water balance in the body.
It stimulates water channels to be inserted into the collecting tubules in the nephrons that make up the kidney. This increases the kidney's ability to reabsorb water instead of excreting it.
Antidiuretic hormone (a synthetic peptide identical to the endogenous nonapeptide hormone with antidiuretic property)
it can help by increasing reabsorption of water by the kidney. With the reabsorption, blood plasma volume increases, thus raising blood pressure
maybe
Erythropoietin, produced by the kidneys, signals RBC formation in the red bone marrow
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