What is it?
Every moment of the day your nervous system is active. It exchanges millions of signals corresponding with feeling, thoughts and actions. A simple example of how important the nervous system is in your behavior is meeting a friend.
First, the visual information of your eyes is sent to your brain by nervous cells. There the information is interpreted and translated into a signal to take action. Finally the brain sends a command to your voice or to another action system like muscles or glands. For example, you may start walking towards him.
Your nervous system enables this rapid recognition and action.
| "The nervous system allows us to perceive, to interpret and to
respond to events from the environment." |
The nervous system is the most complex system of the human body. The human brain itself consists of at least 10 billion neurons.
Single-cell creatures do not need a nervous system. They are in immediate contact with their environment and do not need communication between cells. Multi-celled creatures need the nervous system for the communication between their cells.
What is its function?
There are three general functions of the nervous system in man and animals:
- Sensing specific information about external and internal conditions (In the example above, this is seeing your friend).
- Intergrating that information (This is the understanding of the information coming from the eyes).
- Issuing commands for a response from the muscles or glands (This is the reaction of walking towards him).
The nervous system provides us the ability to perceive, understand and react to environmental events. That is why the nervous system is so extremely important for human behavior.
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Brain 1