A homeostasisThe maintenance of steady conditions. The ability of the body to maintain a constant internal environment, eg temperature and blood glucose concentration. process that controls the amount of water in body fluids (e.g. blood). Poor control can lead to the osmosisThe process by which water moves in and out of cells from a high concentration to a low concentration. damage of body cells.
Gain water
Lose water
Drinking
Evaporation in lungs
Eating
Evaporation of sweat
Respiration
Production of urine/faeces
Gain water
Drinking
Lose water
Evaporation in lungs
Gain water
Eating
Lose water
Evaporation of sweat
Gain water
Respiration
Lose water
Production of urine/faeces
In normal conditions, the amount of water gained balances with the amount lost.
If conditions change, osmoregulationA form of homeostasis which controls the volume of water in the body. brings the volumes back into balance.
Hot weather/exercise
Drink more than normal
Body water levels
Lose more water as sweat
More water in body
Osmoregulation
Kidney produces small volume of concentrated urine. Makes us thirsty so we increase water brought into body
Kidney produces large volume of dilute urine
Effect
More water is retained = water levels increase
More water is lost = water levels decrease
Body water levels
Hot weather/exercise
Lose more water as sweat
Drink more than normal
More water in body
Osmoregulation
Hot weather/exercise
Kidney produces small volume of concentrated urine. Makes us thirsty so we increase water brought into body
