Coordination and control - the nervous system - AQA
The nervous system enables humans to react to their surroundings and to coordinate their behaviour. It comprises millions of neurones and uses electrical impulses to communicate very quickly.
Homeostasis
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:
- the central nervous system – the brain and spinal cord
- the peripheral nervous system – nerve cells that carry information to or from the CNS