Homeostasis

Homeostasis (from Greek: ὅμοιος, hómoios, "similar", and στάσις, stásis, "standing still") is the property of a system that regulates its internal environment and tends to maintain a stable, relatively constant condition of properties such as temperature or pH. It can be either an open or closed system. In simple terms, it is basically a process in which the body's internal environment is kept stable.