|Gain water||Lose water|
|Drinking||Evaporation in lungs|
|Eating||Evaporation of sweat|
|Respiration||Production of urine/faeces|
In normal conditions, the amount of water gained balances with the amount lost.
If conditions change, osmoregulation 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|