How does the nervous system help us respond? - OCR 21st CenturyThe brain

Survival of an organism depends on its ability to respond to changes in the environment. The nervous system allows fast-acting but short-lived responses.

Part ofBiology (Single Science)The human body - Staying alive

The brain

The brain controls complex behaviour. It is made of billions of interconnected neurons and has different regions that carry out different functions.

The brain contains the following main areas:

Labelled diagram of the brain

The functions of these areas are:

Cerebral cortexSplit into two hemispheres and is highly folded. It controls intelligence, personality, conscious thought and high-level functions such as language and verbal memory.
CerebellumControls balance, conscious movement and muscular activity.
Medulla or brain stemControls unconscious activities such as heart rate and breathing rate.
Cerebral cortex
Split into two hemispheres and is highly folded. It controls intelligence, personality, conscious thought and high-level functions such as language and verbal memory.
Cerebellum
Controls balance, conscious movement and muscular activity.
Medulla or brain stem
Controls unconscious activities such as heart rate and breathing rate.