6D - regulation of water balance

bio unit 1

why is osmoregulation important

maintaining water balance is necessary to control salt concentrations

-which impacts the efficiency of biochemical processes

receptors involved in water balance

osmoreceptors (in hypothalamus) - sensitive to blood solute concentrations

baroreceptors (in artria of heart) - detect changes in blood pressure

Anti-Diuretic Hormone

more ADH = more water being reabsorbed by kidneys

(pee less)

water level drops

• water levels drops

• osmoreceptors detect higher concentrations of solutes in blood

• hypothalamus

• pituitary releases more ADH

• person drinks water

water level rises

• water levels rises

• osmoreceptors detect lower concentrations of solutes in blood

• hypothalamus

• pituitary releases less ADH

• kidneys reabsorb more water

inhibitment of ADH release

factors = high water concentration in blood, alcohol

result = urine output increases

cause of ADH release

factors = low water concentrations in blood

urine output decreases