Their are principally 6 substances that the body has to control:
This control is achieved by the use of various organs and glands in the body.
The pituitary gland makes ADH (Anti-diuretic hormone) to control water content in the body.
The muscles can shiver to produce heat if body temperature is too low.
The lungs take in oxygen and give out carbon dioxide.
The kidneys remove urea and adjust ion and water concentration.