Which hormone regulates water reabsorption in the kidney?
Renin
Aldosterone
Vasopressin
Angiotensin
The hormone that regulates water reabsorption in the kidney is option 3 - Vasopressin, also known as antidiuretic hormone (ADH).
Vasopressin is produced in the hypothalamus and released from the posterior pituitary gland in response to changes in blood volume or blood pressure. It acts on the collecting ducts of the nephron in the kidney, causing them to become more permeable to water. This allows more water to be reabsorbed from the urine back into the bloodstream, resulting in a more concentrated urine and conservation of water in the body.
Renin is an enzyme produced by the kidney that plays a role in regulating blood pressure, while aldosterone is a hormone produced by the adrenal gland that helps regulate electrolyte balance. Angiotensin is a peptide hormone that is involved in regulating blood pressure and fluid balance. While these hormones are important for kidney function, they do not directly regulate water reabsorption in the same way that vasopressin does.