Although our sense of thirst usually reminds us to drink enough so that we don't become dehydrated, it is an unreliable signal during hot weather or during heavy
exercise when fluid losses through perspiration are high. Which of the following
explains how your body knows when it needs to conserve water?
Cells in the brain signal the pituitary gland to release antidiuretic hormone,
which signals the kidneys to conserve water.
The hormone aldosterone is released by the adrenal glands. Aldosterone signals
the kidneys to retain sodium and thus conserve water.
The kidneys signal the brain that there is not enough water to excrete.
Antidiuretic hormone causes the body to fully excrete water.