ADH Level in Blood Regulates Water Output by What Mechanism

Question

ADH level in blood regulates water output by what mechanism?
A)The amount of filteration at the glomeruli is altered
B)The amount of water reabsorbed at the nephron loops is altered
C)The amount of water reabsorbed at the distal convoluted tubules and collecting ducts is altered
D)The amount of sodium ions reabsorbed by the distal convoluted tubules and collecting ducts is altered

Accepted Answer

ADH (antidiuretic hormone) regulates water output by controlling the permeability of the distal convoluted tubules and collecting ducts in the nephrons of the kidneys. When ADH is present in the blood, the walls of these tubules become more permeable to water, allowing more water to be reabsorbed and reducing the amount of urine produced. When ADH is absent or low, the walls of these tubules become less permeable to water, causing more water to be excreted in urine. Therefore, the amount of water reabsorbed at the distal convoluted tubules and collecting ducts is altered by ADH levels in the blood.