Right now, billions of tiny messages are racing around your body — telling your heart to beat, your eyes to read, and your hand to turn the page. All of this is managed by the brain and nervous system, the body's amazing control centre.
Neurons: the messengers
A neuron is a nerve cell that carries messages as tiny electrical signals. Neurons pass signals to each other across small gaps, letting information travel from your senses to your brain and back to your muscles — often in a fraction of a second.
The nervous system
The nervous system has two main parts:
- The central nervous system — the brain and spinal cord, which process information and make decisions.
- The peripheral nervous system — the nerves that connect the rest of the body to the central system.
Key brain regions
- The cerebrum — thinking, memory and decisions.
- The cerebellum — balance and coordinated movement.
- The brain stem — automatic jobs like breathing and heartbeat.
Different regions work together so you can, for example, read a word, understand it and turn the page smoothly.
🕌 The Muslim pioneers
Ibn Sīnā (Avicenna, 980–1037) pioneered psychophysiology — the link between mind and body. In a famous account, he diagnosed a young man's hidden heartsickness simply by feeling his pulse quicken whenever certain names were mentioned, showing that emotions produce real changes in the body. Ibn Sīnā also argued, in his "Floating Man" idea, that the self is aware of itself even without the senses — an early insight into consciousness.
The parts, and what each one does
| Part | Its job |
|---|---|
| Neuron | A nerve cell that carries messages as tiny electrical signals, passing them to other neurons across small gaps |
| Central nervous system | The brain and spinal cord — where signals are processed and decisions made |
| The route of a signal | From the senses, to the brain, and back out to the muscles — often in a fraction of a second |
That speed is why you pull your hand back before you have consciously decided to.
Match each term with its description:
- Neuron
- A nerve cell carrying messages as electrical signals
- Central nervous system
- The brain and the spinal cord together
- The gap between neurons
- The small space a signal must cross to pass on