control of water

• too much water in blood:

  • hypothalamus detects high water level
  • pituitary gland releases less ADH
  • so, less water reabsorbed by kidneys
  • large volume of dilute urine produced
• too little water in blood:

  • hypothalumus detects low water level
  • pituitary gland releases more ADH
  • so, more water reabsorbed by kidneys
  • small volume of concentrated urine produced