Which hormone, also known as ADH, reduces urine output to prevent dehydration?

Which hormone, also known as ADH, reduces urine output to prevent dehydration?

• A. Antidiuretic hormone (ADH)
• B. Aldosterone
• C. Insulin
• D. Glucagon

Answer: (A)

Antidiuretic hormone, or ADH, is the hormone that reduces urine output to prevent dehydration. When your body needs to conserve water, ADH is released and acts on the kidneys to make the collecting ducts more permeable to water. This lets more water be reabsorbed back into the bloodstream, so urine becomes more concentrated and its volume drops. The result is preserved body water and maintained blood volume. While aldosterone also helps with fluid balance by increasing sodium reabsorption (and water follows sodium), its main role isn’t the direct, acute reduction of urine output like ADH. Insulin and glucagon regulate blood glucose and energy metabolism, not water excretion, so they don’t directly control urine volume.

Antidiuretic hormone, or ADH, is the hormone that reduces urine output to prevent dehydration. When your body needs to conserve water, ADH is released and acts on the kidneys to make the collecting ducts more permeable to water. This lets more water be reabsorbed back into the bloodstream, so urine becomes more concentrated and its volume drops. The result is preserved body water and maintained blood volume.

While aldosterone also helps with fluid balance by increasing sodium reabsorption (and water follows sodium), its main role isn’t the direct, acute reduction of urine output like ADH. Insulin and glucagon regulate blood glucose and energy metabolism, not water excretion, so they don’t directly control urine volume.