the kidneys make urine by taking waste producers out of your blood
how do substances pass through the kidneys?
substances are filtered out of the blood as it passes through the kidneys. this is called filtration
what happens to useful substances that pass through the kidneys?
substances like glucose and some ions and the right amount of water are then absorbed back into the blood, this process is called selective re absorption
how does water leave the body?
leaves the body via lungs during exhalation
what happens if the body loses or gains too much water?
