#[[ADH]] ([[Antidiuretic hormone]]) from the [[pituitary]] gland, which makes the walls of collecting ducts in [[kidney]]s more permeable to water, which in turn increases extracellular volume. | #[[ADH]] ([[Antidiuretic hormone]]) from the [[pituitary]] gland, which makes the walls of collecting ducts in [[kidney]]s more permeable to water, which in turn increases extracellular volume. |