Homeostasis maintains optimal conditions for enzyme action throughout the body, as well as all cell functions.

In the human body, these include the control of:

  • blood glucose concentration
  • body temperature
  • water levels

These automatic control systems may involve nervous responses (nervous system) or chemical responses (endocrine system ).

Nervous system

The human nervous system consists of:

Diagram of the human body: central nervous system and peripheral nervous systemA diagram showing the central and peripheral nervous system