Question: which one of the following hormones stimulates the kidneys to retain water for the body?
Answer: ADH (Antidiuretic Hormone) When the hypothalamus senses this low blood volume and increased serum osmolality it synthesizes ADH, a small peptide molecule. The pituitary gland then releases ADH into the bloodstream and causes the kidneys to retain water by concentrating the urine and reducing urine volume.