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:

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

Nervous system

The human nervous system consists of:

  • the central nervous system – the brain and spinal cord
  • the peripheral nervous system – nerve cells that carry information to or from the CNS
Diagram of the human body: central nervous system and peripheral nervous system