Where does the water get reabsorbed in the kidneys during osmoregulation?

Renal tubule

Water balance and osmoregulation

• The body:
• ** Gains water from food and drink
  • Loses water by evaporation, urination and defececation.
  • *** Evaporation from the skin takes place all the time but is particularly rapid when we sweat.
    • Air from the lungs is saturated with water vapor which is lost in the atmosphere when we exhale.
• Despite these gains and losses of water, the concentration of body is kept within very narrow limits by the kidneys, which adjust the concentration of blood flowing through them.
• ** If the blood is too dilute, less water is reabsorbed from the renal tubules, leaving more to enter the bladder.
  • If the blood is too concentrated, more water will be absorbed back into the blood from the kidney tubules.
• A rise in blood concentration is thought to stimulate a thirst center in the brain. The drinking which follows this stimulation restores the blood to its correct concentration.
• Osmoregulation: the regulatory processes that keep the blood at a steady concentration.
• • One example of the process of homeostasis