IT IS KNOWN AS HOMEOSTASIS.
Homeostasis is the process by which living organisms maintain a relatively constant internal environment. Maintaining a stable internal environment is very important in living cells because the biochemical reactions of the cells depend on it. If the internal environment is not maintained at equilibrium, the enzymes which catalyze biochemical reactions in the cells will be affected and this will leads to disruptions in the living system. This can lead to the death of the cells, thus is vital that the internal environment be kept constant at all time.