Coordination and Control (the nervous system)

• The nervous system enables humans to react to their surroundings and to coordinate their behaviour.
• The nervous system comprises millions of neurones and uses electrical impulses to communicate very quickly.
• Homeostasis is the maintenance of steady conditions.
• Homeostasis maintains optimal conditions for enzyme action throughout the body, as well as all cell functions.
• Homeostasis involves automatic control systems that may involve nervous responses (central nervous system) or chemical responses (endocrine system).
• The human nervous system consists of the central nervous system (CNS) which includes the brain and spinal cord, and the peripheral nervous system which includes nerve cells that carry information to or from the CNS.